Smart Solutions for your home: YDR 414 has multiple modes of access like Fingerprint, pin code and mechanical key override. Automatic Locking: Auto-Lock automatically secures your front door once it’s closed. Enjoy peace-of-mind never worrying if your door is locked. Convenience: It can upgrade your existing door lock and supports door thickness from 35 mm to 55 mm. No wires, no hassle and easy to replace, with 4 x AA batteries and a warning when they are running low. The lock’s memory will also ensure all credentials and settings remain when changing the batteries, making this simple and hassle free. Low battery alarm and emergency power supply terminal : It warns in case of low battery with alarm and LED. When the batteries are completely discharged, you can easily supply emergency power to the lock with a standard 9V battery. Connectivity: Wire less connectivity with Video Door Phones ( Separate Accessories required) Voice Guide Feature : As the voice guide is offered that lets you know the operation status and how to set each features and mode for easier and more convenient use. Operation Status Notification : Different pattern of numbers present various operation notifications after each operation.