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 DC voltage (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 charged, 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 a touch, 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 x Power 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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!