DES: USB Speakers Item no: CP006 Features: 1.Suitable for PC or your laptop. 2.Support USB2.0 3.support Win95 OSR2/98/98SE/Me/2000/XP/Linux/Mac systems. 4.Impedance: 4&Omega 5.Rate power: 4W x 2 7.Frequency response: 20Hz - 20kHz 8.S/N ratio: 90dB 9.Power demand: 5V/500mA 10.Charging voltage: 5V?V 11.Charging hour: about 2 hours Unit size: 180X72X32mm Package: Gift box (Size: 19X8.5X4.2cm) PCS/CTN: 40PCS N.W.:10.00KGS G.W.:11.00KGS MEAS: 44X36X21cm