Z-Wave Wireless Technology The Yale Assure keypad deadbolt is a single cylinder deadbolt which can be operated from the outside by a keypad or a key. From the inside one simply uses the thumbturn to either lock or unlock it. Furthermore, both inside and outside can be operated by cellphone or smart device. It has the versatility of key-less operation while still retaining the functionality of keyed entry and is a great addition to any smart home. It's perfect for front doors, side or back doors, and garage entry doors. The push button is illuminated for convenient night time entry and programmable with up to 25 user codes. Reversible handing enables it to be installed on left or right handed doors and the motorized tapered bolt helps align door during operation. Includes a 5 pin cylinder with KW1 keyway and packaged with 4 AA alkaline batteries and a 9V backup battery. Z-Wave technology is a next-generation wireless system that unifies all of your home electronics into a single integrated network. Connect any Z-Wave compatible device by simply plugging it into a Z-Wave accessory module, which will then allow you to control your devices remotely through a PC, tablet, or even your cell phone.