The Mobeye Call-Key is a user-friendly and secure remote switch for entrance doors, gates, and situations where access rights change regularly. With an authorized call, electronic locking plates or gate controls are opened. There are no costs incurred for the caller. Granting access rights is simple. In the secure and user-friendly Mobeye portal, rights can be assigned indefinitely or for specific time windows (duration, day, time). The Mobeye Call-Key automatically retrieves these rights and stores them locally. Due to communication via the internal 4G module and the Mobeye SIM card, no internet or Wi-Fi is required on-site. The MCK400 works with all electronic locks and locking plates that respond to a pulse or switch command. A log in the portal shows who used the door control and when. The Mobeye Call-Key features two relay outputs for opening a lock. These are bistable relays that can switch a maximum of 30V/1A. Output 1 activates after an incoming call or SMS command. Output 2 operates according to a defined opening schedule and/or after an SMS command. The relays switch back after a pulse time or upon receiving a new command. Overall, the MCK400 has four NO/NC inputs, two of which can be used to connect alarm contacts. By attaching magnetic contacts and setting suppression times, the Call-Key can also function as a burglary alarm. If the door or gate is opened without a prior call from an authorized number, the configured contacts receive an alarm notification via app, call, SMS, or email. The device comes with an indoor housing. For outdoor use, the manufacturer offers the MCK400 in an IP66 housing as a special order. The Call-Key is delivered with the Mobeye Multi-Provider SIM card.