Support reading MP3 songs in TF card and U disk;Working Voltage : AC 220V or DC 12 24V Support independent adjustment of treble, bass and master volume With AUX Audio input, can be connected to the computer, mobile phone or CD Digital power amplifier, peak power 400W, can drive 4Ohm 100 magnetic speakers Dual microphone input, adjustable reverb; built-in Bluetooth wireless Receiver and FM radio Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. Power Wiring Instructions (Please follow the instructions carefully to avoid unnecessary damage): 1. The panel DC12V/24V interface can be connected to DC 12V or DC 24V, and the current requirement is more than 3A (available battery or power adapter) 2, panel AC 100-240V interface can be connected to AC100V-240V AC power with 8 word power cable (not contact the circuit board after power on, so as to avoid electric shock). Wiring instructions: 1. Connect the subwoofer: connect a speaker with about 100 magnets or a speaker with about 100W 2, Connected to the tweeter: can be connected to 30W tweeter (It can also be disconnected) Add a capacitor when the tweeter is connected 3. Suitable for 8-12 inch speakers. Notice: Please turn off the small master volume before power-on test. Then increase the volume slowly after power-on. If the sound is intermittent or the sound is hoarse and distorted during the process of increasing the vol colour:Black Material:Composite material size:18 x 8 x 5cm Voltage: AC100-240V Package Contents: 3 x Digital Bluetooth Stereo Amplifier Board 3 x Remote control 3 x Bass Cable 3 x DC Cable 3 x Power supply cable