Four Channel Amplification. 4x75 Watts Total Output. Variable Gain Control/Remote Turn On/Off. MOSEFT Pulse Modulation Power Supply. 4 Ohm Speaker Impedance. Built-in Bass and Treble Control. Gold Plated RCA Low Level Inputs. S/N Ratio: Greater Than 85dB. Frequency Response: 15-30k Hz. Overload/Thermal/Short Circuit Protection. Power On LED Indicator. Automotive Type Fuse Protection. Dimensions: 9W x 2.24H x 10 2/3D.