The product type is 2 x 30 Watt stereo amplifier kit, features: the easy way to add quality stereo amplification to your project excellent sound quality Low noise, low distortion Short circuit and overload protected (1 h max.) On- board rectifier and smoothing capacitor Just add a center tap transformer Complete with heatsink. Specifications: Maximum RMS power output: 2 x 15W/4 Ohm - 2 x 10W/8 Ohm Harmonic distortion: 0.07% (1W/1kHz) Channel separation: 70 dB Frequency Response: 7 Hz to 60 kHz (-3 dB) Signal/noise ratio: 98 dB (A Weight) input sensitivity: 300 mV / 20 kohm, power supply: 2 x 12V / 2A or 24VCT/2A (50W centertap transformer) (Refer to the User's, Manual for alternate power options) Dimensions: 69 x 51 mm / 2.7" x 2".