The device features two relays and three digital inputs; a change in their state can trigger the sending of an SMS message. It has an internal database that can store up to 1,000 phone numbers, which can be called to open the door or barrier. The device can be configured locally via a USB app, remotely via the internet using a GPRS connection, or via SMS messages. The relays can also be activated via a smartphone (Android and/or iPhone) by installing a widget, without needing to dial any phone numbers. The ESIM120 is particularly suitable for opening access gates in residential complexes, garages in apartment buildings, or even campsites.

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