Compatible with Xbox Series and Xbox One wireless controllers. For 8Bitdo Dual Charging Dock only. Note: It can be only charged with 8Bitdo Dual Charging Dock. Package includes 11100 mAh rechargeable battery pack 1Battery door for Xbox One controller 1Battery door for Xbox Series X|S controller. Charging overload protection 3 hours charging time with 8Bitdo Dual Charging Dock for one controller.