diff --git a/esphome/components/const/__init__.py b/esphome/components/const/__init__.py
index 3201db5dfda..059bf3f26a9 100644
--- a/esphome/components/const/__init__.py
+++ b/esphome/components/const/__init__.py
@@ -8,14 +8,17 @@ BYTE_ORDER_BIG = "big_endian"
 
 CONF_COLOR_DEPTH = "color_depth"
 CONF_CRC_ENABLE = "crc_enable"
+CONF_DATA_BITS = "data_bits"
 CONF_DRAW_ROUNDING = "draw_rounding"
 CONF_ENABLED = "enabled"
 CONF_IGNORE_NOT_FOUND = "ignore_not_found"
 CONF_ON_PACKET = "on_packet"
 CONF_ON_RECEIVE = "on_receive"
 CONF_ON_STATE_CHANGE = "on_state_change"
+CONF_PARITY = "parity"
 CONF_REQUEST_HEADERS = "request_headers"
 CONF_ROWS = "rows"
+CONF_STOP_BITS = "stop_bits"
 CONF_USE_PSRAM = "use_psram"
 
 ICON_CURRENT_DC = "mdi:current-dc"
diff --git a/esphome/components/openthread/__init__.py b/esphome/components/openthread/__init__.py
index 5861c3db3f6..5c64cf31dce 100644
--- a/esphome/components/openthread/__init__.py
+++ b/esphome/components/openthread/__init__.py
@@ -4,13 +4,20 @@ from esphome.components.esp32 import (
     VARIANT_ESP32C6,
     VARIANT_ESP32H2,
     add_idf_sdkconfig_option,
+    get_esp32_variant,
     include_builtin_idf_component,
     only_on_variant,
     require_vfs_select,
 )
 from esphome.components.mdns import MDNSComponent, enable_mdns_storage
 import esphome.config_validation as cv
-from esphome.const import CONF_CHANNEL, CONF_ENABLE_IPV6, CONF_ID, CONF_USE_ADDRESS
+from esphome.const import (
+    CONF_CHANNEL,
+    CONF_ENABLE_IPV6,
+    CONF_ID,
+    CONF_OUTPUT_POWER,
+    CONF_USE_ADDRESS,
+)
 from esphome.core import CORE, TimePeriodMilliseconds
 import esphome.final_validate as fv
 from esphome.types import ConfigType
@@ -45,6 +52,20 @@ CONF_DEVICE_TYPES = [
 ]
 
 
+def _validate_txpower(value):
+    if CORE.is_esp32:
+        variant = get_esp32_variant()
+
+        # HW limits: Datasheet section "802.15.4 RF Transmitter (TX) Characteristics"
+        # Further regulatory/soft limit may apply, e.g. by region
+        if variant in (VARIANT_ESP32C6, VARIANT_ESP32C5):
+            return cv.int_range(min=-15, max=20)(value)
+        if variant == VARIANT_ESP32H2:
+            return cv.int_range(min=-24, max=20)(value)
+
+    return value  # Unsupported, fail later with clear error
+
+
 def set_sdkconfig_options(config):
     # and expose options for using SPI/UART RCPs
     add_idf_sdkconfig_option("CONFIG_IEEE802154_ENABLED", True)
@@ -155,6 +176,10 @@ CONFIG_SCHEMA = cv.All(
             cv.Optional(CONF_TLV): cv.string_strict,
             cv.Optional(CONF_USE_ADDRESS): cv.string_strict,
             cv.Optional(CONF_POLL_PERIOD): cv.positive_time_period_milliseconds,
+            cv.Optional(CONF_OUTPUT_POWER): cv.All(
+                cv.decibel,
+                _validate_txpower,
+            ),
         }
     ).extend(_CONNECTION_SCHEMA),
     cv.has_exactly_one_key(CONF_NETWORK_KEY, CONF_TLV),
@@ -197,4 +222,7 @@ async def to_code(config):
     cg.add(srp.set_mdns(mdns_component))
     await cg.register_component(srp, config)
 
+    if (output_power := config.get(CONF_OUTPUT_POWER)) is not None:
+        cg.add(ot.set_output_power(output_power))
+
     set_sdkconfig_options(config)
diff --git a/esphome/components/openthread/openthread.cpp b/esphome/components/openthread/openthread.cpp
index d22a14aeae6..92897a7e96e 100644
--- a/esphome/components/openthread/openthread.cpp
+++ b/esphome/components/openthread/openthread.cpp
@@ -43,6 +43,9 @@ void OpenThreadComponent::dump_config() {
     ESP_LOGCONFIG(TAG, "  Device is configured as Minimal End Device (MED)");
   }
 #endif
+  if (this->output_power_.has_value()) {
+    ESP_LOGCONFIG(TAG, "  Output power: %" PRId8 "dBm", *this->output_power_);
+  }
 }
 
 bool OpenThreadComponent::is_connected() {
diff --git a/esphome/components/openthread/openthread.h b/esphome/components/openthread/openthread.h
index 9e429f289b8..728847afa54 100644
--- a/esphome/components/openthread/openthread.h
+++ b/esphome/components/openthread/openthread.h
@@ -38,6 +38,7 @@ class OpenThreadComponent : public Component {
 #if CONFIG_OPENTHREAD_MTD
   void set_poll_period(uint32_t poll_period) { this->poll_period_ = poll_period; }
 #endif
+  void set_output_power(int8_t output_power) { this->output_power_ = output_power; }
 
  protected:
   std::optional<otIp6Address> get_omr_address_(InstanceLock &lock);
@@ -45,6 +46,7 @@ class OpenThreadComponent : public Component {
 #if CONFIG_OPENTHREAD_MTD
   uint32_t poll_period_{0};
 #endif
+  std::optional<int8_t> output_power_{};
   bool teardown_started_{false};
   bool teardown_complete_{false};
 
diff --git a/esphome/components/openthread/openthread_esp.cpp b/esphome/components/openthread/openthread_esp.cpp
index 9dd68a1ccce..2af78b729f3 100644
--- a/esphome/components/openthread/openthread_esp.cpp
+++ b/esphome/components/openthread/openthread_esp.cpp
@@ -135,6 +135,12 @@ void OpenThreadComponent::ot_main() {
            TRUEFALSE(link_mode_config.mRxOnWhenIdle));
 #endif
 
+  if (this->output_power_.has_value()) {
+    if (const auto err = otPlatRadioSetTransmitPower(instance, *this->output_power_); err != OT_ERROR_NONE) {
+      ESP_LOGE(TAG, "Failed to set power: %s", otThreadErrorToString(err));
+    }
+  }
+
   // Run the main loop
 #if CONFIG_OPENTHREAD_CLI
   esp_openthread_cli_create_task();
diff --git a/esphome/components/speaker/media_player/__init__.py b/esphome/components/speaker/media_player/__init__.py
index b302bd9b23c..42ca762858f 100644
--- a/esphome/components/speaker/media_player/__init__.py
+++ b/esphome/components/speaker/media_player/__init__.py
@@ -15,6 +15,8 @@ from esphome.const import (
     CONF_FORMAT,
     CONF_ID,
     CONF_NUM_CHANNELS,
+    CONF_ON_TURN_OFF,
+    CONF_ON_TURN_ON,
     CONF_PATH,
     CONF_RAW_DATA_ID,
     CONF_SAMPLE_RATE,
@@ -401,6 +403,9 @@ FINAL_VALIDATE_SCHEMA = cv.All(
 
 
 async def to_code(config):
+    if CONF_ON_TURN_OFF in config or CONF_ON_TURN_ON in config:
+        cg.add_define("USE_SPEAKER_MEDIA_PLAYER_ON_OFF", True)
+
     var = await media_player.new_media_player(config)
     await cg.register_component(var, config)
 
diff --git a/esphome/components/speaker/media_player/speaker_media_player.cpp b/esphome/components/speaker/media_player/speaker_media_player.cpp
index fdf6bf66cd5..3f5cb2fda62 100644
--- a/esphome/components/speaker/media_player/speaker_media_player.cpp
+++ b/esphome/components/speaker/media_player/speaker_media_player.cpp
@@ -51,7 +51,11 @@ static const UBaseType_t ANNOUNCEMENT_PIPELINE_TASK_PRIORITY = 1;
 static const char *const TAG = "speaker_media_player";
 
 void SpeakerMediaPlayer::setup() {
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+  state = media_player::MEDIA_PLAYER_STATE_OFF;
+#else
   state = media_player::MEDIA_PLAYER_STATE_IDLE;
+#endif
 
   this->media_control_command_queue_ = xQueueCreate(MEDIA_CONTROLS_QUEUE_LENGTH, sizeof(MediaCallCommand));
 
@@ -128,6 +132,12 @@ void SpeakerMediaPlayer::watch_media_commands_() {
     bool enqueue = media_command.enqueue.has_value() && media_command.enqueue.value();
 
     if (media_command.url.has_value() || media_command.file.has_value()) {
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+      if (this->state == media_player::MEDIA_PLAYER_STATE_OFF) {
+        this->state = media_player::MEDIA_PLAYER_STATE_ON;
+        publish_state();
+      }
+#endif
       PlaylistItem playlist_item;
       if (media_command.url.has_value()) {
         playlist_item.url = *media_command.url.value();
@@ -184,6 +194,12 @@ void SpeakerMediaPlayer::watch_media_commands_() {
     if (media_command.command.has_value()) {
       switch (media_command.command.value()) {
         case media_player::MEDIA_PLAYER_COMMAND_PLAY:
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+          if (this->state == media_player::MEDIA_PLAYER_STATE_OFF) {
+            this->state = media_player::MEDIA_PLAYER_STATE_ON;
+            publish_state();
+          }
+#endif
           if ((this->media_pipeline_ != nullptr) && (this->is_paused_)) {
             this->media_pipeline_->set_pause_state(false);
           }
@@ -195,10 +211,26 @@ void SpeakerMediaPlayer::watch_media_commands_() {
           }
           this->is_paused_ = true;
           break;
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+        case media_player::MEDIA_PLAYER_COMMAND_TURN_ON:
+          if (this->state == media_player::MEDIA_PLAYER_STATE_OFF) {
+            this->state = media_player::MEDIA_PLAYER_STATE_ON;
+            this->publish_state();
+          }
+          break;
+        case media_player::MEDIA_PLAYER_COMMAND_TURN_OFF:
+          this->is_turn_off_ = true;
+          // Intentional Fall-through
+#endif
         case media_player::MEDIA_PLAYER_COMMAND_STOP:
           // Pipelines do not stop immediately after calling the stop command, so confirm its stopped before unpausing.
           // This avoids an audible short segment playing after receiving the stop command in a paused state.
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+          if (this->single_pipeline_() || (media_command.announce.has_value() && media_command.announce.value()) ||
+              (this->is_turn_off_ && this->announcement_pipeline_state_ != AudioPipelineState::STOPPED)) {
+#else
           if (this->single_pipeline_() || (media_command.announce.has_value() && media_command.announce.value())) {
+#endif
             if (this->announcement_pipeline_ != nullptr) {
               this->cancel_timeout("next_ann");
               this->announcement_playlist_.clear();
@@ -366,7 +398,13 @@ void SpeakerMediaPlayer::loop() {
       }
     } else {
       if (this->is_paused_) {
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+        if (this->state != media_player::MEDIA_PLAYER_STATE_OFF) {
+          this->state = media_player::MEDIA_PLAYER_STATE_PAUSED;
+        }
+#else
         this->state = media_player::MEDIA_PLAYER_STATE_PAUSED;
+#endif
       } else if (this->media_pipeline_state_ == AudioPipelineState::PLAYING) {
         this->state = media_player::MEDIA_PLAYER_STATE_PLAYING;
       } else if (this->media_pipeline_state_ == AudioPipelineState::STOPPED) {
@@ -399,7 +437,13 @@ void SpeakerMediaPlayer::loop() {
             }
           }
         } else {
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+          if (this->state != media_player::MEDIA_PLAYER_STATE_OFF) {
+            this->state = media_player::MEDIA_PLAYER_STATE_IDLE;
+          }
+#else
           this->state = media_player::MEDIA_PLAYER_STATE_IDLE;
+#endif
         }
       }
     }
@@ -409,6 +453,20 @@ void SpeakerMediaPlayer::loop() {
     this->publish_state();
     ESP_LOGD(TAG, "State changed to %s", media_player::media_player_state_to_string(this->state));
   }
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+  if (this->is_turn_off_ && (this->state == media_player::MEDIA_PLAYER_STATE_PAUSED ||
+                             this->state == media_player::MEDIA_PLAYER_STATE_IDLE)) {
+    this->is_turn_off_ = false;
+    if (this->state == media_player::MEDIA_PLAYER_STATE_PAUSED) {
+      this->state = media_player::MEDIA_PLAYER_STATE_IDLE;
+      this->publish_state();
+      ESP_LOGD(TAG, "State changed to %s", media_player::media_player_state_to_string(this->state));
+    }
+    this->state = media_player::MEDIA_PLAYER_STATE_OFF;
+    this->publish_state();
+    ESP_LOGD(TAG, "State changed to %s", media_player::media_player_state_to_string(this->state));
+  }
+#endif
 }
 
 void SpeakerMediaPlayer::play_file(audio::AudioFile *media_file, bool announcement, bool enqueue) {
@@ -481,6 +539,9 @@ media_player::MediaPlayerTraits SpeakerMediaPlayer::get_traits() {
   if (!this->single_pipeline_()) {
     traits.set_supports_pause(true);
   }
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+  traits.set_supports_turn_off_on(true);
+#endif
 
   if (this->announcement_format_.has_value()) {
     traits.get_supported_formats().push_back(this->announcement_format_.value());
diff --git a/esphome/components/speaker/media_player/speaker_media_player.h b/esphome/components/speaker/media_player/speaker_media_player.h
index 6796fc9c003..3fa6f47b848 100644
--- a/esphome/components/speaker/media_player/speaker_media_player.h
+++ b/esphome/components/speaker/media_player/speaker_media_player.h
@@ -144,6 +144,9 @@ class SpeakerMediaPlayer : public Component,
 
   bool is_paused_{false};
   bool is_muted_{false};
+#ifdef USE_SPEAKER_MEDIA_PLAYER_ON_OFF
+  bool is_turn_off_{false};
+#endif
   uint8_t unpause_media_remaining_{0};
   uint8_t unpause_announcement_remaining_{0};
 
diff --git a/esphome/components/uart/__init__.py b/esphome/components/uart/__init__.py
index 69db4b44aae..3bc4263b31f 100644
--- a/esphome/components/uart/__init__.py
+++ b/esphome/components/uart/__init__.py
@@ -4,6 +4,7 @@ import re
 
 from esphome import automation, pins
 import esphome.codegen as cg
+from esphome.components.const import CONF_DATA_BITS, CONF_PARITY, CONF_STOP_BITS
 from esphome.config_helpers import filter_source_files_from_platform
 import esphome.config_validation as cv
 from esphome.const import (
@@ -11,7 +12,6 @@ from esphome.const import (
     CONF_BAUD_RATE,
     CONF_BYTES,
     CONF_DATA,
-    CONF_DATA_BITS,
     CONF_DEBUG,
     CONF_DELIMITER,
     CONF_DIRECTION,
@@ -21,12 +21,10 @@ from esphome.const import (
     CONF_ID,
     CONF_LAMBDA,
     CONF_NUMBER,
-    CONF_PARITY,
     CONF_PORT,
     CONF_RX_BUFFER_SIZE,
     CONF_RX_PIN,
     CONF_SEQUENCE,
-    CONF_STOP_BITS,
     CONF_TIMEOUT,
     CONF_TRIGGER_ID,
     CONF_TX_PIN,
diff --git a/esphome/components/usb_uart/__init__.py b/esphome/components/usb_uart/__init__.py
index cc69c0cb5a7..f0ee53d0281 100644
--- a/esphome/components/usb_uart/__init__.py
+++ b/esphome/components/usb_uart/__init__.py
@@ -1,5 +1,6 @@
 import esphome.codegen as cg
 from esphome.components import socket
+from esphome.components.const import CONF_DATA_BITS, CONF_PARITY, CONF_STOP_BITS
 from esphome.components.uart import UARTComponent
 from esphome.components.usb_host import register_usb_client, usb_device_schema
 import esphome.config_validation as cv
@@ -7,12 +8,9 @@ from esphome.const import (
     CONF_BAUD_RATE,
     CONF_BUFFER_SIZE,
     CONF_CHANNELS,
-    CONF_DATA_BITS,
     CONF_DEBUG,
     CONF_DUMMY_RECEIVER,
     CONF_ID,
-    CONF_PARITY,
-    CONF_STOP_BITS,
 )
 from esphome.cpp_types import Component
 
diff --git a/esphome/components/weikai/__init__.py b/esphome/components/weikai/__init__.py
index 66cd4ce12aa..bc80f167efb 100644
--- a/esphome/components/weikai/__init__.py
+++ b/esphome/components/weikai/__init__.py
@@ -1,18 +1,16 @@
 import esphome.codegen as cg
 from esphome.components import uart
+from esphome.components.const import CONF_DATA_BITS, CONF_PARITY, CONF_STOP_BITS
 import esphome.config_validation as cv
 from esphome.const import (
     CONF_BAUD_RATE,
     CONF_CHANNEL,
-    CONF_DATA_BITS,
     CONF_ID,
     CONF_INPUT,
     CONF_INVERTED,
     CONF_MODE,
     CONF_NUMBER,
     CONF_OUTPUT,
-    CONF_PARITY,
-    CONF_STOP_BITS,
 )
 
 CODEOWNERS = ["@DrCoolZic"]
diff --git a/esphome/const.py b/esphome/const.py
index bbd85ca66b4..d5625f6a549 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -280,7 +280,6 @@ CONF_CUSTOM_PRESETS = "custom_presets"
 CONF_CYCLE = "cycle"
 CONF_DALLAS_ID = "dallas_id"
 CONF_DATA = "data"
-CONF_DATA_BITS = "data_bits"
 CONF_DATA_PIN = "data_pin"
 CONF_DATA_PINS = "data_pins"
 CONF_DATA_RATE = "data_rate"
@@ -760,7 +759,6 @@ CONF_PAGE_ID = "page_id"
 CONF_PAGES = "pages"
 CONF_PANASONIC = "panasonic"
 CONF_PARAMETERS = "parameters"
-CONF_PARITY = "parity"
 CONF_PASSWORD = "password"
 CONF_PATH = "path"
 CONF_PATTERN = "pattern"
@@ -963,7 +961,6 @@ CONF_STEP_PIN = "step_pin"
 CONF_STILL_THRESHOLD = "still_threshold"
 CONF_STOP = "stop"
 CONF_STOP_ACTION = "stop_action"
-CONF_STOP_BITS = "stop_bits"
 CONF_STORE_BASELINE = "store_baseline"
 CONF_SUBNET = "subnet"
 CONF_SUBSCRIBE_QOS = "subscribe_qos"
diff --git a/esphome/core/defines.h b/esphome/core/defines.h
index 6e40af7b83f..5f058733bdd 100644
--- a/esphome/core/defines.h
+++ b/esphome/core/defines.h
@@ -236,6 +236,7 @@
 #define USE_LWIP_FAST_SELECT
 #define USE_WAKE_LOOP_THREADSAFE
 #define USE_SPEAKER
+#define USE_SPEAKER_MEDIA_PLAYER_ON_OFF
 #define USE_SPI
 #define USE_VOICE_ASSISTANT
 #define USE_WEBSERVER
diff --git a/tests/components/openthread/test.esp32-c6-idf.yaml b/tests/components/openthread/test.esp32-c6-idf.yaml
index 9df63b2f29b..77abc433c14 100644
--- a/tests/components/openthread/test.esp32-c6-idf.yaml
+++ b/tests/components/openthread/test.esp32-c6-idf.yaml
@@ -13,3 +13,4 @@ openthread:
   force_dataset: true
   use_address: open-thread-test.local
   poll_period: 20sec
+  output_power: 1dBm
diff --git a/tests/components/speaker/common-media_player_off_on.yaml b/tests/components/speaker/common-media_player_off_on.yaml
new file mode 100644
index 00000000000..a5bea62c84d
--- /dev/null
+++ b/tests/components/speaker/common-media_player_off_on.yaml
@@ -0,0 +1,18 @@
+<<: !include common.yaml
+
+media_player:
+  - platform: speaker
+    id: speaker_media_player_id
+    announcement_pipeline:
+      speaker: speaker_id
+    buffer_size: 1000000
+    volume_increment: 0.02
+    volume_max: 0.95
+    volume_min: 0.0
+    task_stack_in_psram: true
+    on_turn_on:
+      then:
+        - logger.log: "Turn On Media Player"
+    on_turn_off:
+      then:
+        - logger.log: "Turn Off Media Player"
diff --git a/tests/components/speaker/media_player_off_on.esp32-idf.yaml b/tests/components/speaker/media_player_off_on.esp32-idf.yaml
new file mode 100644
index 00000000000..2d5eefff19b
--- /dev/null
+++ b/tests/components/speaker/media_player_off_on.esp32-idf.yaml
@@ -0,0 +1,9 @@
+substitutions:
+  scl_pin: GPIO16
+  sda_pin: GPIO17
+  i2s_bclk_pin: GPIO27
+  i2s_lrclk_pin: GPIO26
+  i2s_mclk_pin: GPIO25
+  i2s_dout_pin: GPIO23
+
+<<: !include common-media_player_off_on.yaml
diff --git a/tests/integration/fixtures/external_components/uart_mock/__init__.py b/tests/integration/fixtures/external_components/uart_mock/__init__.py
index dea8c385513..8deab4c21ec 100644
--- a/tests/integration/fixtures/external_components/uart_mock/__init__.py
+++ b/tests/integration/fixtures/external_components/uart_mock/__init__.py
@@ -1,6 +1,7 @@
 from esphome import automation
 import esphome.codegen as cg
 from esphome.components import uart
+from esphome.components.const import CONF_DATA_BITS, CONF_PARITY, CONF_STOP_BITS
 from esphome.components.uart import (
     CONF_RX_FULL_THRESHOLD,
     CONF_RX_TIMEOUT,
@@ -12,14 +13,11 @@ import esphome.config_validation as cv
 from esphome.const import (
     CONF_BAUD_RATE,
     CONF_DATA,
-    CONF_DATA_BITS,
     CONF_DEBUG,
     CONF_DELAY,
     CONF_ID,
     CONF_INTERVAL,
-    CONF_PARITY,
     CONF_RX_BUFFER_SIZE,
-    CONF_STOP_BITS,
     CONF_TRIGGER_ID,
 )
 from esphome.core import ID