This Bluetooth amplifier module is a good choice for replacing modules. It can provide you with excellent performance 2.1 channel amplifier board, which is easy to install and use. It is convenient to replace 2.1 channel amplifier module, which can provide stable and fast connection and wide compatibility. The amplifier board has 2 input methods: Bluetooth input and AUX input. The amplifier module allows you to adjust level of frequency, treble, bass, etc.<br><br>Color: Black Material: Metal<br><br>Package Contents: 1 x -TB21 2.1 channel amplifier<br><br>Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.