Features: brand new and high quality Intelligent fingerprint recognition, not possible to make mistakes, long battery life. It can be charged by USB interface, can last about three months after charging for three hours, fast recognition in 0.5 seconds. It can warn in advance to prevent the battery from running out when the battery is low, up to 20 sets of fingerprints can be recorded, very convenient to use. It has the ability to quickly identify fingerprints, made of waterproof, rust-proof, shear-resistant and saw-proof material, ensuring safety. Made of zinc or aluminum alloy, for tough and unbreakable, can resist 650kg pulling force after many times' tests three colors are available to choose. Specifications: Material: Zinc Alloy/Aluminum Alloy Size: Approx. 8x2.2 for cm/3.15x0.87 inch Color: Black/Red/Silver Note: Charging with Type C charger. Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Piece Fingerprint Lock