Key features and benefits Codec support for fidelity wireless audio: AAC, aptX LL, aptX HD, and LDAC. This enables compatibility with a wide range of devices and the potential for resolution Bluetooth audio. Easy control with dedicated function keys: KCOM, PLAY, VOL, VOL, P/V, , MODE. These keys provide quick access to playback, volume, and mode changes without needing to reach for a device. Reliable 3.3V logic compatibility: level 3V3 is valid, ensuring straightforward integration with common host boards and control circuits. Bluetooth status indicator output: The BTHL output pin signals Bluetooth connection status. When Bluetooth is connected, BTHL outputs (3.3V); when disconnected, it outputs 0V. This simplifies integration with host processors and indicators. Analog differential outputs for audio paths: RP, RN, LP, LN provide balanced left and right differential outputs suitable for precise audio signaling and flexible wiring. LDAC default when used with a box: With an enclosure, the system negotiates the protocol LDAC by default (5125 is the default setting). This helps maximize audio quality in compatible configurations. Serial port AT command interface: Supports AT commands through a serial connection at 115200 baud, with 8 data bits, no parity, and 1 stop bit (115200, N, 8, 1). This enables straightforward integration and remote control in embedded applications. Use scenarios Scenario 1: Upgrading a portable audio box to support LDAC and aptX HD for wireless listening. Connect to LDACcompatible headphones or speakers and enjoy higher quality streaming with flexible codec options and quick playback controls. Scenario 2: Integrating into a home or studio audio box with balanced analog outputs. Use RP/RN and LP/LN for clean differential audio paths, leverage AT command control for automation, and monitor Bluetooth state via the BTHL pin for synchronized device management. Scenario 3: Development and projects. Use AT commands for remote configuration, rely on the LDAC default for wireless audio in LDACcapable setups. Specifications and compatibility Model: 5125 Codecs supported: AAC, aptX LL, aptX HD, LDAC Function keys: KCOM, PLAY, VOL, VOL, P/V, , MODE Power/logic level: 3.3V level valid Bluetooth status output: BTHL (3.3V when connected, 0V when disconnected) Analog outputs: RP, RN, LP, LN (differential) Enclosure interaction: protocol LDAC by default (5125) Serial interface: AT commands, 115200 baud, N, 8, 1 Notes All features are provided as described for integration with compatible devices and configurations. No additional external features or specifications are assumed beyond those listed.