This case is the first of its kind in that it is actually two cases in one. It comes with a very thin protective case that y ou can have on your phone all the time and when you need an extra power boost, simply slide that case into the charging sleeve and you have instantly doubled your life! This allows you to enjoy the slimness of the handset while still being protected, and also gives you power whenever you need it without having the bulk of a thick case all the time like traditional charging cases. These cases are certified by the phone manufacturers so you are ensured of Getting a great product. You can charge and sync your device while in the case with the included micro USB cable. Recommended add-on is the tempered glass to protect the screen while in the case. One year warranty.