protocol and pairing information: when used with a box, supports the LDAC codec with 5125 default as the protocol, with clear pairing information for easy setup. Codec and sonic performance: supports AAC, APTX LL, APTX HD, and LDAC to deliver flexible, quality wireless audio playback. Serial control and configuration: supports serial port AT commands with 115200 baud, 8 data bits, no parity, 1 stop bit (115200, N, 8, 1) for reliable hardware control. Android mobile app : can be controlled from an Android app to modify Bluetooth name (supports any language), set pairing password, EQ, and switch prompt tone for tailored user experience. Analog differential outputs: provides balanced analog differential output with RP, RN, LP, and LN for fidelity audio connections. Bluetooth connection status output: BT_HL status output indicates connection state; when Bluetooth is connected the output is 3.3 V , and when disconnected the output is 0 V. Button and control interface: function keys include KCOM, PLAY, VOL+, VOL, P/V, +, MODE; all active with level 3.3 V logic. Electrical and compatibility details: 3.3 V logic levels are valid for operation, ensuring compatibility with standard digital interfaces and control signals. Use scenarios: Upgrade a wired audio setup to wireless resolution playback in a home stereo system, using LDAC for better sound quality and easy appbased . Integrate into a DIY DAC or portable box, using AT command control for firmware and behavior tuning, plus Android app settings for Bluetooth name, password, and EQ. In car or portable audio projects requiring balanced analog outputs and clear Bluetooth status signaling, with reliable 3.3 V level control for seamless system integration.