Features: brand new and high quality 4-IN-1 ADVANCED AUTO-LOCK. Smart fingerprint lock, passwords lock, app remote unlock leads you to a simple mordern and convenient lifestyle. Fingerprint and emgency key, after enrolling your fingerprint, helps you never carry the key to go out, two backup keys( package inlcued) just work as emgency key or reserve key. BATTERY OPERATED. 4 pieces AAA batteries operated. NOTICE: Battery not inlcuded. Low battery alarm. With designed usb interface, when batteries power off, keys unlcok or fingerprint unlock after connecting USB for temporarily emergent charge, no need worry about being locked outside. HIGH PERFORMANCE. Regular smart lock and APP smart lock 2 optional. Adopts quality metal material, newly upgrade circut board, optimize the 360 identification function of dry, wet and incomplete fingerprints. Make your home life more secured and smart. Great for home, office, homestay, homeowners, tenants and more. MULTIPLE UNLOCK METHODS. Advanced 4-in-1 unlock: fingerprint unlcok; passcode unlcok; smartphone unlcok; key unlcok. Set up fingerprint passcode in home, bringing you a fast and best secure recognition system. Works perfect for kids and the elder. You don't worry about forgetting to bring the key/smartphone. SIMPLE INSTALLATION. Easy to install in minutes. NO Wiring NO Drilling required. Fit for door thickness of 1.18-2.76 inch (30-70mm). Both left handed/right handled doors are available. Package Includes: 1 Set Smart Fingerprint Door Lock ( Batteries Not Included ) Specifications: Material: Metal Color: Black; Silver Specifications: Fingerprint Door Lock Type-A: Fingerprint Smart Lock Type-B: Fingerprint Smart Lock with APP Control Interface: USB Bettery : 4 x AAA Batteries ( Not Included ) Fingerprint Capacity: 30 Fingerprints Working Temperature: -20-55 Recognising Time: 0.25s Total Size: Approx. 16.5x7cm/6.50x2.76in Handle Length: 15cm/5.91in Fit for: Door Thickness in 30-70mm/1.18-2.75in Weight: Approx. 1050g note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you