360⁰ Fingerprint Sensor - Unlock with your finger within 0.4 second || 30 fingerprint Storage. Bluetooth Mobile APP. - This lock completely operate through LAVNA SmartLife mobile application. You can Add or Delete any fingerprint via mobile app. || Bluetooth Unlocking : you can also unlock the door from your LAVNA Smart Life mobile app with in the bluetooth range. DIY Installation : This lock is very easy to install, any normal carpenter can install the lock with the help of our installation video also our customer care team will support online thru Calls and Video calls Manual Key Access - This lock also contains a computerized mechanical key for manual unlocking. LAVNA LA15 Lock is suitable for wooden doors only, minimum door thickness require 28 mm. Low Power indication : When battery level goes under 15% lock will give you low power reminder External power Port : if your locks batteries dies completely , you can give power to the lock externally and unlock it with your registered Fingerprint.. Safety Tips : We strongly suggest to use Duracell Long Lasting (AAA Alkalines) batteries only for best battery back. 1 Year off-site warranty.