TSA3117 are designed for factory or DIY user. Bluetooth/LINE IN select switch and audio input port are designed as JST connectors. So, user can install this amplifier board in a box and connect an external switch and RCA/Mono plug to make their own audio amplifier. TSA3117 can also connect with our TSA1000 external audio volume control board. People can adjusting the audio volume by rotating a real knob. TSA3117 2x50W audio amplifier board with AudioB plus Bluetooth module. It has perfect class-D architecture(Based on TPA3116D2) and every channel has 50W power ouput. Both of channels are capable of outputting nominal power simultaneously and continuously. This board can be powered by any DC10V-24V power supply, it can be used to drive any 4? or 8? passive speakers. It's perfect for your Hi-Fi application. You may wish to pair with a mobile phone or a computer (etc). Power the amplifier board. Use your phone or PC (etc) to search for a new Bluetooth device. The module will appear as "BT Speaker". You don't need a PIN, pair it and then you can play music. *BVC Port: BVC port can connect with our Audio volume controller to control the Bluetooth audio volume. Features: -Size: 6.9cm x 9.5cm -Bluetooth 4.0-Bluetooth audio volume control port(BVC) -Working voltage: DC10V-24V -Over/under voltage protection -Over current protection -Over temperature protection Applications: -Personal computer -Background music system -Musical instrument amplifiers -Home DIY -Car audio