Microlab MD220 Portable Stereo Speaker for Tablet, Smartphone and Notebook(Black) Output Power:2 Watt RMS Power Distribution: 2x 1 WattRMS Frequency Range: 150 Hz - 20 kHz Speakers: 4x 1.5-Inch Speaker Driver Type, 2x 2 Watt, 4 Ohm Speaker Rated Powe Interfaces: NIL (output), 3.5mm stereo (input) Output power:?2 Watt RMS Power distribution: 2x 1 Watt RMS Frequency range: 150 Hz - 20 kHz Speaker driver type: 4x 1.5 Speaker rated power: 2x 2 Watt, 4 Ohm Color: Black