Zebronics BT4440RUCF 4.1 Channel Multimedia Speakers

LED Display, Supports USB pen drive and SD/MMC card
Built-in FM Blue LED Power indicator, Fully functional remote control
Output power (RMS):20W + 10W x 4, Frequency response:20Hz – 20KHz
Impedance Subwoofer drive :4 Ohms Satellite drive : 4 Ohms
Sensitivity : 500mV, S/N Ratio : ≥ 72dB, Separation : ≥ 45dB, Subwoofer drive size