Memory store when power off, Support last time working state memory when power off. Support RCA, USB flash disk input model switching.4 volume control knobs, the volume of the 4 speakers can be adjusted independently. Max output power: 50W4 4? THD: 0.05%(1kHz 1W). U-disk support format: MP3, WMA, APE, FLAC, WAV.. Dimensions(WDH): 12813433mm / 5.045.281.30in. 1 x Power Audio Amplifier 1 x 24V/4.5A Power supply 1 x AC power cord 1 x User Manual. This item is in the category "Sound & Vision\Home Audio & HiFi Separates\Amplifiers & Pre-Amps". The seller is "liproeshop" and is located in this country: GB. This item can be shipped to United Kingdom.