Internal/External Keypad with built in Proximity facility surface mounted, Strong Zinc Alloy Electroplated anti vandal case, full programming from keypad, 12vdc , additional Wiegand input (RD26-C), Alarm input, Door bell, Backlit buttons, back tamper and up to 500 users. Size 120(H) x 76(W) x 27(D) all mm. ONLY EXTERNAL IF USED WITH RAINSHIELD Supplied as a kit with RD26-1 included