BOSS Audio R1002 Car Amplifier &ndash; 2 Channel, 200 Watts Max Power, 2/4 Ohm Stable, Class A/B, Full Range POWER: Maximum Power output of 200 Watts at 2 Ohms into two channels. Maximum power output of 100 Watts at 4 Ohms into two channels HIGH LEVEL INPUTS: Speaker level inputs are commonly referred to as high-level inputs. Speaker level inputs will be used to connect the R1002 to your factory radio or an aftermarket radio that does not have low-level (RCA) inputs LOW LEVEL INPUTS: Line level inputs, also known as RCA inputs or low-level inputs, use RCA interconnect cables to link the R1002 with the source unit. Most aftermarket radios have multiple pairs of RCA outputs that can connect to multiple amplifiers VARIABLE INPUT GAIN CONTROL: The Variable Input Control allows the amplifier input to match the output signal from the head unit to achieve optimum performance when adjusted properly. WARRANTY: BOSS Audio Systems provides a Powerful 6 Year Platinum Online Dealer Warranty so long as the purchase is made through Amazon Dot Com