GSM switch Gate Opener GPRS 4G Door Opener(RTU5025) Remote Access Control Unit 999 users open Gate - AliExpress
2-way Remote Network Control Switch Gprs Distribution Box Relay Module Temperature And Humidity Acquisition Alarm - Instrument Parts & Accessories - AliExpress
Modul monitorizare și control prin GPRS Teracom TCG140, cu 2 intrări digitale, 4 intrări analogice, 4 ieșiri releu, Modbus