Qrio Smart Lock Q-SL1 - Keyless Bluetooth Door Lock with Mobile App Control - Secure & Convenient Smart Home Access for Apartments, Offices & Vacation Rentals

Easy installation on your home door without any construction work. Your smartphone is the key to your home. Don't forget to lock the key with the auto lock function. Batteries can operate for up to 600 days (when 4 batteries are inserted, 2 batteries are included). You can insert 4 batteries, but it will be driven by 2 batteries to notify you that the battery is dead.