Features: Sensitive and High CapacityThe semiconductor fingerprint head, which is 1.5~2 times better than optical fingerprint sensor, works well with anyone 4-80 years old. Durable and Easy DIY InstallationMade of zinc alloy, it is collision proof, waterproof, and rust proof. It takes only several minutes to install, but you may need to drill a small hole on the old door. Fingerprint+Emergency keyThe smart fingerprint door lock use advanced biological fingerprint technology,only need 0.1s to unlock. Emgency key is prepared for going out and forgetting replace battery. Low energy power supplyIt needs 4 pcs AAA dry batteries. When it runs out, red light will flash to remind you to change battery. There is also a USB interface for emergency charging. More Secure and ConvenientThe recognition rate is up to 98%. One-touch unlock, it can read fingerprint in 360 degrees to unlock within 0.1S, making your life more secure and convenient. Specification: Material: Zinc Alloy Port: USB port Battery: 4Pcs x AAA dry batteries(not included) Size: About 145 x 28 x 65mm/5.71x1.1x2.56inches Package Includes: 1x Biometric Keyless Entry Door Handle note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.