Telephone-type keypad that allows the door to be opened by entering a previously programmed code of up to 6 digits. Autonomous access control system. For installations where simple access control is required, without incident logging, to complement the electronic door entry system and allow neighbors access to the building, for example: offices, small offices, garages. Autonomous Power: 12 Vac / Vdc. Up to 100 user codes (Code length from 4 to 6 digits).