Specification:

Charger Dock
1.Input Voltage: 5V
2.Outpurt Voltage: 3V
3.Dock Size: 8.6 X 5.2 X 3.5cm(L X W X H)
4.Cable Legth: 57cm
5.Color: Black

Battery Pack
1.Voltage: 3.7 V
2.Capacity: 3600 mAh
3.Color: Black
4.Weight: 40g
5.Dimensions: 5.7 X 3.7 X 1.8 cm / (L x W x H)
6.Compatible with:For XBOX 360

Charger Cable:
1.Weight: 57g
2.Length:176.5cm
4.Color: Black

Features:
1.Battery pack (included) fits Xbox 360 wireless controllers
2.Charge cable plugs into USB ports on the console
3.Plug & Play - completely ready to use!