Fangrui Product Details Product Name: Karaoke Front-end Board With Bt And Usb Decoding Input Voltage: Wide Voltage Range Of 8-36vdc, Unable To Input Ac Bt Chip: Mountain View Bp1048b2, Bt 5.0 Bt Decoding Formats: , Aac Bt Distance: 15m Usb Decoding Format: Mp3, Wav, Flac, Ape, With A Bit Rate Of Less Than 1500kbps Microphone Interface: Dual 6.35mm Microphone Interface Power Interface: Dc5.5-2.1 Female Socket, Or Wiring Terminal, Choose Either Audio Output Interface: 3.5mm Headphone Stand, Or Xh2.54-3p Socket, Choose Either Working Modes: Bt, Aux, Usb Drive/sound Card Indicator Light Status: The Blue Light Flashes Slowly In Usb And Aux Modes, Remains On Continuously After A Successful Bt Connection, And Flashes Excessively Slowly When There Is No Connection. Start , Red Light Flashing To Search For Pairing, Red Light Constantly On Left Channel, Red Light Slowly Flashing Right Channel. Mode Priority: Inserting Usb Or Aux Can Preemptively Interrupt Bt, And The Mode Can Be Memorized After Power Failure. Bt Cannot Be Found In Usb O