24V geared motor with optical encoder. Control unit with microprocessor, built-in automatic supervision system and power supply. Toric transformer. Electro-magnetic security lock. Steel wheels on bearings and heavy-duty nylon track. Aluminium cover. Digital program selector. Internal lock release. Battery system that allows door to open/close with capacity for 100 or 120 operations in the event of a power failure. Anti-trapping device.