You can set up the Chamberlain Clicker Universal Wireless Keypad Garage Door Opener outside and conveniently open or close without using a remote control or key. It is designed to work with all garage door opener units manufactured after 1993 that make use of the photo-eye safety sensors for operation. You can quickly install and program this battery-powered garage door opener. The backlight lets you use the garage door opener keypad even at night. The four digit PIN ensures the maximum safety. This Chamberlain garage door opener comes with mounting hardware for ease of installation. The opener is powered by a nine-volt battery.