Power output: R/L: RMS 4.5W+4.5W SW: 12W Signal to noise rate: L/R 85dBA SW 80dBA Frequency response: 80Hz-20KHz Input sensitivity: AUX R/L: 400±50mV SW: 120±20mV Bluetooth R/L: 450±50mFFS SW: 150±20mFFS Input type: AUX/USB/SD card/Bluetooth Bass unit: 4 inches Treble unit: 2 3/4 inches