Ultra-long battery life | Equipped with a 400mAh super-capacity battery, it can last for two years Prevent Malicious Tracking | If your PINCARD is not on you, iOS will send you a reminder Privacy protection | Find My network information will be encrypted to protect your privacy Ultra-thin card design | easy to put in the wallet, can also be hung on the handbag luggage, etc., can be used in a variety of occasions Compatibility: Only compatible with Apple devices iPhone and iPod touch series with iOS 14.5 or above iPad series with iPadOS 14.5 or later Only compatible with Apple devices iPhone and iPod touch series with iOS 14.5 or above (Android incompatible) The battery of this product cannot be removed or replaced. Our warranty doesn't cover batteries that wear down from normal use Built in battery Non-rechargeable and cannot be replaced