3G 4G GSM Gate Opener Access Remote Control by Free Phone Call Home Alarm Systems Security for Automatic Door Opener RTU5024 ,Easy to Use

> Quad-band, can work in the worldwide GSM Networks; > No call charges. the GSM GPRS Relay Switch rejects the call from authorized number then carries out the turn ON/OFF action on the first 'ring'; > Multiple applications. (gates, bollards, barriers, garage doors, shutters and access doors or machines); > Secure - Using caller-ID for identification, unknown callers are ignored; > Can be operated from anywhere, no distance limit;