Features:The board uses the classic circuit of the TPA3110, while using a single power supply with anti-reverse function. Power can be used with adapters and switching power supplies. Most of the resistive container parts are standardized and patched, which is simple and stable. Designed a special interface for the bluetooth audio receiver module, built-in 5V voltage regulator circuit, It is very easy for DIY bluetooth speaker.Specifications:Working voltage: DC 8V-26VOutput power: 15W X 2 (@16V)Working current: greater than or equal to 2ASpeaker impedance: 4-8OhmWork efficiency: greater than or equal to 90%bluetooth version: V4.2Package Included:5 x TPA3110 bluetooth 4.2 Digital Amplifier Board 15Wx2