Product Feature Thickened design provide stronger shear and tensile resistance; Silicone wrap does not hurt the frame; 600mAh Type-C Charging; Smart NFC unlocking:NFC card unlock,NFC card sticker unlock,Mobile phone NFC unlock; Key unlock:A total of 2 keys and 1 key number plate with serial number; Waterproof treatment effectively ensures that the lock body still works reliably in rainy.