Description: High quality RCA input/output socket. Power switch, with USB port for MP3,MP4 charge. Volume 7 color LED display,with FM radio:87-108MHZ. Treble, Bass, Balance, Volume control. Supply voltage?12-14.4V DC 3-5A. Specification: Technical parameter: Total harmonic distortion: ?0.4% S/N?75dB. Frequency Response?29?18KHz distortion??0.1(1KHz) Output Power?RMS 25W X 2CH ?AT 14.4V DC INPUT? Size: 112x90x38mm Package Includes: 1 Piece Audio Amplifier