Model 1.5125 Key capabilities Codecs supported: AAC, aptX LL, aptX HD, LDAC Physical controls: function keys KCOM, PLAY, VOL+, VOL, P/V, +, MODE Output: 3.3V level is valid Analog outputs Analog differential output: RP, RN, LP, LN Protocol, control and app features When used with a compatible box, the protocol is LDAC (5125 default) Serial control: supports AT commands at 115200 baud, 8 data bits, no parity, 1 stop bit (115200, N, 8, 1) Android app support: can modify Bluetooth name (supports any language), pairing password, custom EQ, and switch prompt tone Status signaling Bluetooth connection status output BT_HL Bluetooth connected: outputs 3.3V Bluetooth disconnected: outputs 0V Use scenarios Home audio setup Use with a compatible DAC or receiver to enable LDAC quality wireless streaming Leverage the analog differential outputs to feed a stereo amplifier or audio interface Use the physical keys to control playback without looking at a device DIY / embedded projects Integrate via AT command interface for custom automation and control in microcontroller or SBC projects Use 115200 8N1 serial settings for configuration and debugging Use the Android app to rename the device, set pairing parameters, and adjust EQ and prompt tones Mobile or vehicle integration Monitor connection status via BT_HL to trigger external actions or indicators Maintain flexible Bluetooth naming and password options for easy pairing in varying environments Notes on compatibility and performance LDAC remains the protocol available when used with a compatible box, with 5125 as the default setting 3.3V level logic is used for the BT_HL status output and other signals The configuration and control options are designed to support both consumergrade usage and integration in DIY or professional setups while preserving the specified functions and codecs This description preserves the original model, functions, and specifications, presented in clear, customerfocused language with concise bullet points and practical use cases.