Product Name: AmplifierModel Number: AP-2100Place of Origin: ChinaSpecifications: 1) Output power (4 ohms): 25W x 4 2) Signal to noise ratio (S/N): 90dB 3) Total harmonic distortion (THD): 0.1% 4) Frequency response: 20Hz - 20kHz 5) Dimensions (L x W x H): 102 x 31 x 78mm Packing: gift box