This product is a 5.2 BT TWS case matching function; Support 5w*2 speakers; Support 3.5aux; Hands free call; 3pout output The voltage is 5v/ the current is 2A. After secondary development of peripheral hardware, the maximum power can be configured to reach 5W. The Bluetooth device name is ymx-878bt Power supply: DC (3.7-5v) and current above 2a-3a; USB socket is a charging input socket; When charging, the red light is on, and when fully , the red light is not on), please select lithium battery with protection board If the TWS function is used, two BT modules must be used (touch the key signal pin with a light switch or a wire to touch the GND ground, that is, the TWS is connected by mutual scanning; note that it is , not a long press short circuit); A module can only have ordinary BT function. When a board connected to TWS is mono; The board is stereo when TWS is disconnected Colour:As shown Material:PC+Metal Package Contents: 1 Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.