DROK TDA2030L UTC Digital Audio Amplifier 34W+34W DC 12-36V/ AC 9-25V BTL Stereo Amp Board 12V/24V, Blue Ultra small size (120x55x35mm), light weight, easy and convenient to use. Requires for AC/DC single power supply, wide power supply (AC9-25V; DC12-36V). Adopts 34W+34W dual-channel BTL circuit which is composed of 4 pieces UTC TDA2030L chip. With two 3300U/50V large filter capacitor, no output capacitance, provide stable operating environment. High power, good sound quality, no distortion, give you a great hearing enjoyment.