Features 1、True Wireless Stereo: With box matching function, it can use two power amplifier modules of the same model, easily separate left and right channels, without any wired connection; Providing HiFi sound quality and supporting multiple input methods, it is the ideal choice for individual audible and video spaces 2、2 Indicator Lights: This amplifier module has two indicator lights that provide clear status information and display whether the module is running normally, which is convenient to control and operate. This thoughtful design makes it simple to use the module and enjoy excellent music 3、Knob Function: This amplifier module adopts a multifunctional knob design, which easily adjusts the volume, audible playback and pause, and switches to the next song; Long press to turn on/off, three press to enter true wireless stereo mode, easily access all functions, enhance your audible experience 4、4 Input Methods: This module supports BT, AUX, USB flash drive, and USB sound card input. It can be wirelessly connected to your device through BT, or connected to a TV, computer, or audible device through AUX input. It supports USB and easily plays music files or computer audible 5、Wide Application: This amplifier board is widely suitable for BT audible applications, and its excellent sound quality provides excellent music and movie experiences, making it suitable for home and office use; Easy to install and use, a practical choice for music enthusiasts and ordinary users Specification Item Type: Audible Amplifier Module Channel: Single Channel 30W Input Method: AUX + BT + USB Amplifier Chip: For TPA3110D2 Adaptive Speaker: 5-30W 4-8Ω Adaptive Power Supply: DC 9-24V Protecting Mechanism: Reverse Connection, Under Voltage, Overheat, Over Current, Short Circuit Guard (Auto Recovery, No Need to Restart) Output Power: ≤30W Voltage Gain: 30dB Product Size: Approx. 71 x 51 x 46mm / 2.8 x 2 x 1.8in Package List 1 x PCB Board Top Cover 1 x PCB Board 1 x Knob Cap 1 x PCB Board Bottom Cover 4 x M2x14 Copper Standoff 8 x M2x3 Screws 4 x M2x3 Copper Standoff 1 x Screwdriver 1 x Adapter 1 x User Manual