Aiphone LEF-3L 3-Call Master Station with Selective Door Release

Coordinate three calling points through one central intercom master position with selective door-release capability. The Aiphone LEF-3L is a 3-call master station for physical-security and communications installations where an operator, reception point, or controlled entry location must manage calls from multiple connected stations. Three-call capacity gives the master position defined call coverage for smaller multi-point systems. Selective door release lets the operator control door release from the master station rather than treating every call point as a common release function. This makes the unit suited to entry configurations where the receiving location needs to identify the calling point before operating access control. External-device control requires a compatible relay for each external device that must be operated. Account for that relay requirement when planning door strikes, gates, lights, or other connected control loads. The master station concentrates call handling and selective release at one location, while the external-device relay requirement keeps each controlled output separately provisioned.