Features Adopting high performance amplifier chip, practical and durable. Providing high quality sound quality and compatibility, and overall performance is superior. 100% brand new and high quality. 5W left channel and 5W right channel, dual channel output, high efficiency. Good sound quality, suitable for upgrading and refitting the idle sound box and DIY production. 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