AJAX MultiRelay Fibra Four Channel Relay Module is a device that allows you to remotely control power supply to connected appliances through four relay outputs with potential-free contacts. It features bistable, normally closed (NC), normally open (NO), and pulse operation modes, with adjustable pulse time from 10 seconds to 2 hours. The module is protected against overheating and short circuit, and offers remote control and configuration via a mobile app. It is compatible with AJAX hubs and communicates using encrypted Fibra technology over a wired U/UTP cable connection.