Features Provides high sound quality and compatibility, and the overall performance is superior. Good sound quality, suitable for upgrading and retrofitting the idle resonance box and in-house production. Adopting a high-performance amplifier chip, practical and durable. 5W left channel and 5W right channel, dual channel output, high efficiency. High quality. Specification: Material: Electronic Components Weight: 11g/0.4oz Channel number: two-channel Output impedance: 2Ω-8Ω. DC power supply: DC 5V 2A Output power: 3W-10W speaker Product packaging: anti-static packaging. Installation dimensions: 28 mm. Size(L*W*H): 40*34*12mm/1.6*1.3*0.5 inch Package list: 1 x Bluetooth Amplifier Module 3 x 2P wire. Note: 1. This product charging interface is a current limiter charging mode, without charging management, please use a battery with protective plate. It is recommended to use a 3.7V battery (battery requires a protective board) with USB charging port to charge the battery. The USB port can be used as a power supply or 5V adapter power supply. 2. Can not use a dry battery and charge treasures and transformers and other unstable voltage and power sources. 3. This product is in standby mode for 10 minutes, will automatically shut down and needs to be restarted. Package List