Features:
- Frequency response:150-18KHz(±3dB)
- Signal and Noise of Power amplifier:≧80dB
- Loud speaker:1.77 inch(external diameter 45mm) magnetic resistant 4 Ohms
- Line in:configure 3.5mm stereos plugs，U Disk，SD/MMC Card
- Power supply:Built-in Litheium battery,5V/1000mA AC ADAPTER,PC USB
- Lithium battery input:3.7V
- Charge voltage: 4.2-5V
- Battery capacity:500mAh
- Built-in MP3 player that can play SD / MMC memory card MP3 player music files,
- also read U disk
- Supports all iPod charger (with 30pin) for playing music