
4 Channel Bluetooth Wall Amplifier with FM Radio USB SD & Doorbell Trigger for Hotel Commercial Background Music. 2*25W High Efficiency Output: Class-D amplifier delivers 2*25W max power for 2 to 8 speakers. 2.8 Inch Color LCD Display: 480*480 IPS screen shows track info with light touch buttons. Multi-Format Media Support: Plays MP3, WMA, WAV, AAC, APE via USB, TF card, or Bluetooth. Wireless Remote Control: Full control for seek, track change, and volume adjustment. Built-in Digital Radio: Auto-tuning supports 30 preset FM radio stations. Doorbell Linkage Trigger: Supports linkage trigger function for security systems. RS485 System Integration: Optional RS485 port allows third-party system integration. Phoenix Connectors: Secure and fast audio input/output with phoenix connectors.