MASTERcode ™ 3-channel microtransmitter. The MASTERcode ™ Access Control System is perfectly suited to automatic garage doors, barrier parking and electric door openers. It stands out for its simplicity of coding. It offers a great scope to the facilities. The range is complemented by an autonomous access control system that allows basic management of RFID keys. Requires 1 battery type 23A or similar (not included).