The BY-AM1 by Boya is a two-channel audio mixer. You can use the BY-AM1 for dynamic and condenser microphones, electric instruments and other line/mic signals. Boya has developed the BY-AM1 in a metal housing, with the front panel made of plastic. No battery is required; power is supplied via the usb port. Exclusively through this sales channel, you will receive a three-year warranty on the BY-AM1, after registration via the warranty card in the packaging.