Features Wide Application: The audio power amplifier board that strengthens low-power, inaudible electronic audio signals such as the signal from radio receiver that is strong enough for driving loudspeakers or headphones. Dual Channel: The audio power amplifier board composed of high-performance inductor and high-performance capacitor, Dual channel of 5+5W power output. Easy to Use: The installation of the AMP board is simple and does not require particularly complicated operations. At the same time, the audio power amplifier board supports the USB charging function, which is convenient to use in real life. Premium Material: This digital power amplifier board is made of high-quality material, manufactured by many experts through precise craftsmanship, which has a long service life. Intimate Service: We provide 7-day worry-free return and exchange service for all customers. If you have any questions about our bluetooth amplifier board, you are welcome to contact us, we will serve you wholeheartedly. Specification: Material: Electronic Components Weight: 11g/0.4oz Channel Number: Dual channel Output impedance: 2Ω- 8Ω  DC Power Supply: DC 5V 2A  Output Power: 3W-10W speakers Product Packaging: Anti-static packaging  Installation Dimensions: 28mm Size (L*W*H): 40*34*12mm/1.6*1.3*0.5inch Package List: 1 x Bluetooth Amplifier Module 3 x 2P Wire Note: 1.This product charging interface is current limiter charging mode, without charge management, please use lithium battery with protective plate. It is recommended to use 3.7V lithium battery (lithium battery needs protection board) with USB charging port for lithium battery charging, USB port can be used as power supply or 5V adapter power supply.  2.Can not use dry battery and charging treasure and transformer and other voltage and current unstable power supply.  3. This product is in standby mode for 10 minutes will enter automatic shutdown, need to restart.  Package List