Julong Music Angel Mini Portable Speaker Player SD/TF Card for PC iPod MP3 player Out put: RMS 6W(3W+3W) THD=10% Frequency response: 150-18000Hz (3dB) Signal and noise ratio of power amplifier: 80dB Loud speaker 1.77 inches(external diameter 45mm) magnetic resistance 4 Ohms Line in: configure 3.5mm stereo plugs