Features Advanced Mute Control System: Features a dedicated MUTE terminal for seamless control over your power amplifier, ensuring optimal o performance during playback Versatile Power Supply Options: Easily powered via MICRO USB, 5V power supply, or 3.7V lithium battery, ensuring flexible installation for any o setup High-Quality o Output: Directly connect earphones to the 3.5mm o interface, or wire for enhanced o input to your power amplifier, delivering superior sound quality Features: 1、M18: MUTE mute control terminal: used to control the power amplifier board. When muting, MUTE outputs a high level of 3.3V, and outputs a low level during playback. KEY button control: This function requires additional connection of resistors and buttons to achieve Volume power off function: The default output is 100% volume. Press the button to control the volume increase and decrease. If the control volume is less than 15%, the volume output will be 15% after power‑on; if the control volume is greater than 15%, the original volume will remain unchanged after power‑on. 2、M28: Power supply: It can be directly powered by the MICRO USB for Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. o output: The earphone can be directly connected to the 3.5mm o interface, or it can be wired for the o input of the power amplifier board. 3、M38 Power supply: It can be directly powered by the MICRO USB for Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. The maximum working current is 5V2A. It is recommended to use 5V2A regulated power supply for better sound quality. Support USB sound card, drive (plug and play) Connect the module to the computer with the USB cable, and the computer can play music through the module amplifier output. 4、For Bluetooth V4.2 version of for Bluetooth automatic technology, supports WAV / WMA / FLAC / APE / MP3 lossless decoding, stereo two-channel output 5、After powering on the module, the phone searches for the for Bluetooth name MH‑M18 / MH‑M28 / MH‑M38, and can play music when connected to for Bluetooth. 6、Widely used in various for Bluetooth o receivers, DIY conversion of various sounds, etc. Specification: Item Type: Module Function / modelRight channel output (direct speaker) Blue Module: The light blinks when for Bluetooth is not connected The indicator light usually li Package List 1 x Module