RTU5024 GSM Gate Opener Relay Switch By Free Call 850/900/1800/1900MHz Remote Control Door Access Wireless Door Opener Module ,Ultra-Quiet Operation

Add or remove users by SMS Text com mand. The relay close or open time is programmable. Can be operated from anywhere, no distance limit. Quad-band, can work in the worldwide GSM Networks. No need to provide a remote control or keys for different users.