5-in-1 Smart Lock: This smart lock offers five unlocking methods: fingerprint, password, card, key, and Bluetooth. It's the perfect choice to help you unlock a \"smart and convenient life.\" [Equipped with a fingerprint recognition door handle] Meets British standards and works on most doors. This electronic door handle lock can be used on both left and right-handed doors. No extra drilling or locksmith required. Installation can be completed in minutes with just a screwdriver. Door thickness: 35 mm to 55 mm. Long battery life and low battery warning: This electronic door lock consumes little power and has a low battery warning function. The black electronic door lock uses four AAA batteries, providing approximately 12 months of battery life, depending on usage. If the battery runs out, you can use the included backup key or an emergency opening via the USB port. Therefore, you no longer have to worry about being locked out. High security for peace of mind: This bedroom lock is made of robust and durable alloy steel and zinc alloy, providing extra security for your room. It is suitable for front doors, bedrooms, hotels, apartments, interior doors, or other private spaces.