2-in-1 secret message pen, diary with code Do not recharge non-rechargeable batteries. Rechargeable batteries should only be charged under adult supervision. Rechargeable batteries must be removed before charging. Do not put the battery in fire: the battery may leak or explode. Remove the battery if it is depleted or if the product is not used for a long time. Works with 3 LR41/AG3 batteries included Age: 5-12 Years Gender: F