Atlas Sound ECS-KSW3MKey Lock Remote Wall Plate for Use with ECS-3 is a single gang electrical cover plate that works in conjunction with the ECS-3 electrical sequencer. For the user's convenience and ease of use The ECS-3 electrical sequenceris equipped with a remote activated and monitored using the ECS-KSW3M control panel. This panel can be placed several hundred feet away from the ECS-3 sequencer. A Keyed On / Off switch is provided for security. It has a Red LED On/Off Indicator.