The keypad can be mounted beside the door to be controlled. The electronics are mounted in an aluminium housing which is designed to resist weather and vandalism. The keys are engraved stainless steel. It is suitable for all kinds of environments, indoors or outdoors, and has a built-in heater to keep the unit ice-free. If the keypad is opened, a tamper contact will transmit an alarm to the controller. The keypad is surface mount only.