Bluetooth 5.2, supports serial port name change, refer to compatible with HY5066TWS module user manual, supports one-click TWS pairing, supports AUX insertion into the TWS case without disconnection, powers on automatically, supports hands-free calling, default volume is maximum, with volume synchronization TX, RX, GND: TTL serial port configuration 9600, N, 8, 1 At 24V 4A, maximum output power is 2×50W; at 19V 4A, maximum output power is 2×40W; 8–24V power supply, with reverse polarity protection, compatible with notebook power adapters After pairing with TWS, pairing is retained permanently LED indicator: After TWS setup, single board LED stays on and outputs left channel; dual board LED blinks and outputs stereo sound Material: Plastic Dedicated control buttons P/V–: Short press for next track; long press to decrease volume N/V+: Short press for previous track; long press to increase volume PLAY: Short press to play/pause Double-click to toggle ShareMe mode, after TWS setup, audio channel switches automatically in sequence Stereo channel assignment, left/right/stereo Press and hold for 3 seconds to reject or re-pair phone, host only TWS: Short press for one-button TWS pairing Double-click to cycle through EQ modes, 9-band EQ Press and hold for 3 seconds until audible prompt confirms release Press and hold for 6 seconds to clear pairing history and restore EQ to default Product appearance and printed markings may vary slightly between batches; such variations do not affect functionality Package Contents: 1 × Development Board