DanaPad V3 Pushbutton Smart Lock Bluetooth accessory - Black Finish
The Danapad attaches to an outside wall or door frame via a mounting plate provided in the Danapad package.

Additional Information:
4 X AAA batteries
Bluetooth 4.2
256bit AES encryption level

Compatible with smart lock (Danalock V3) and Universal Module

Note: Bluetooth is mainly used for linking computers and electronic devices in an ad-hoc ( when needed) way over very short distances, often for only brief or occasional communication using relatively small amounts of data. It's relatively secure, uses little power, connects automatically.