Product information: Size: 85*50 * 19MMproduct information Lock body material: zinc alloy Lock beam material: Alloy Steel Relative humidity: product information10% to 85%product information Operating system: Android 9.0 or IOS8.0 or later Protection level: IP55product information Waterproof grade: IPX5 Color: Black product information Temperature Range:-20 ℃ to 65 ℃product information Unlocking Method:product information APP unlocking, NFC bracelet unlockingproduct information