Model: rtu5024 (3g version optional) Name: gsm gprs 3g 4g relay switch gate opener Keyword: Gsm gprs 3g 4g gate opener, gsm gprs 3g 4g garage opener, gsm gprs 3g 4g relay, gsm gprs 3g 4g switch, gsm gprs 3g 4g remote control, wireless switch, wireless relay, access control. The gsm gprs 3g 4g relay gsm switch gate opener rtu5024 is a upgrade version of gsm gate opener, it supports 200 authorized users, the authorized users can call in to open the gate or switch on off the equipments with a free charge call at the specified time. Mainly features: 1.Gsm frequency: 850/900/1800/1900mhz , 2.Frequency:850/1900mhz, 900/2100mhz, 850/2100mhz(optional), can work in the worldwide gsm/3g networks; 3.No call charges. The gsm relay rejects the call from authorized number then carries out the turn on/off action on the first 'ring'; 4.Multiple applications. (gates, bollards, barriers, garage doors, shutters and access doors or machines); 5.Add or remove users by sms text commands; 6.No need to provide a remote control or keys for different users; 7.Up to 200 authorized phone numbers can be configured at the specified time; 8.1 output with relay rating 3a/240vac for connecting the switch of the door or machines. Applications: 1.Remote open/close swing/sliding gates, doors, shutters, garage doors, locks with a free call! 2.Residential: door, gate, garage access control, electronic fan, microwave, air-conditioner control. 3.Industry: remote switch equipment, for example: street lights, solar power, motor, inverter, plc, pumps, fans, etc. 4.Agriculture: remote control pumps, etc. 5.Business: remote control electronic boxes, bright billboards, led signs, etc.