Note: This device does not support built-in sound control, press to open/close, pause/playback, or 360 degree endless volume adjustment. Input options and control - Supports Aux input, Bluetooth input, and U disc playback - App connections are via Bluetooth control App usage - Use procedure: Open Bluetooth on the mobile phone and enable location positioning; - In the app process interface, go to Yellow Point, click Bluetooth, then Bluetooth, and search for Sinilink-App Hardware and performance - [TPA3116 HIFI CHIP] This Bluetooth Power Amplifier Card uses the TPA3116 chip - Stereo dual-channel output - Peak power up to 50W+50W - Wide DC input voltage: 5-24V Use scenarios - Home audio enhancement: pair with a phone to drive two speakers for hi-fi stereo in a living room or bedroom - USB disc playback: connect a U disc to play stored music through the amplifier - DIY audio projects: integrate with a 5-24V DC supply to build a compact two-channel amplifier for custom speaker setups Key attributes - Function: two-channel Bluetooth power amplification with multiple input options - Compatibility: AUX input, Bluetooth input, U disc playback; Bluetooth control via Sinilink-App - Power and voltage: peak power up to 50W+50W per channel; DC input 5-24V - Material and size: not specified in the original specification - Performance: designed for reliable stereo amplification using the TPA3116 HIFI chip This description preserves the brand and specifications while presenting clear benefits, practical use cases, and straightforward setup steps.