Technical characteristics :
capacity: 3500 mAh
power: 2 W
frequency range: 200-20000 Hz
audio: 90 dB +/- 3
resistance: 4 ohms
USB input: 5 V / 1000 mA
USB output: 5 V / 1000 mA
USB + micro-USB charging cable
Audio cable compatible with iPhone, iPod, iPod Touch, Android Phone, PSP, MP3, MP4, etc.