this is a cheap rechargeable battery for your xbox 360 controllers. this is what the website says:
- Top quality product
- Compatible with XBOX 360 wireless controller
- Rechargeable cable: USB to DC 2.35 * 0.7 DC cable with direct plug
- Battery pack: output voltage = DC 2.4V
- Capacity: 1800mAh
very cheap and easy to use.