Key lock mechanism in alphanumeric telephone keypad format. Large keys for easy operation, even in low light conditions. The spacious interior (85x61x12 mm) prevents jamming, even when multiple keys are included. Create your own combination with up to 12 letters and/or numbers. A protective rain cover prevents freezing and jamming. The molded housing and vinyl-coated shackle prevent scratches. Wall mounting is available for permanent installation.