Includes DSi console screw driver and built-in 5400mAH lithium battery. Open the console back cover with screw driver and take out the original battery, then put the bttery into protection case. It can get longer playing time to use the original battery with the built-in lithium battery together. Can connect with console and charger for console. There is place to put TT, R4 card in the button of the case. With 1pcs more touch pen as the spare. Made of the PC material, protect your console perfectly. For repair and replacement.