Bluetooth 5.2, supports serial port name change (refer to 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 Color: As shown 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 Note: Lighting conditions and display settings may cause slight color variation between images and actual product. Measurement tolerance: ±1–3 cm.