TheSA202-II-RDT Mini Amplifier with Power SupplyfromSoundTube Entertainmentis an ultra-compact, 2-channel amplifier with extra heat sink surfaces for extended duty at full power. Rated at 20 watts per channel output at 4 ohms with max gain of 35 dB. Dual RCA, stereo mini jack, and high-level inputs, and it features a 12-volt trigger for automatic on/off functions when source power is detected. Mounting hardware is included and adapts to pole, surface or security attachment installations. this item includes a 14V, 3A power supply.