Mini Hamburger Stereo Speaker Music Player for Iphone Ipod Pc Laptop Black Mp3 Output: 2.4w Rating power: 1.8w Size: 50wX50LX35H(mm) Speaker: 36mm micro speaker, 4Ohm Frequency response:100Hz-2kHz Singal-to-noise: &gt;85dB Distortion: &lt;0.5% Battery Voltage: 3.7V Battery Charging voltage: 4.2V Charge Time: DC(2.5hours), USB(4Hours) Package include: 1x USB power input cable 1x Mini speaker 1x User guide