【Professional Design】: GSM Opener RTU5035 is a very simple device that can be used to authorize access doors, target control, remote devices and switching of parking systems. 【Safe Use】: You don't have to worry that strangers can control your GSM device to open the door. You can authorize door access, control targets, and protect your assets cost-effectively. 【Free Call】: There is no calling fee. GSM Gate Opener rejects calls from authorized numbers and then performs ON/OFF operation at the first time. So you can open your garage door with free calls from your cell phone. 【Smart Control】: You can open the door with your mobile phone toll-free number, or you can set the device to open the door quickly through the app. The closing relay or opening time is programmable. 【Widely used】: Based on GSM network, it can usually be used for doors, guardrails, shutters, parking systems, household appliances, computer rooms, greenhouses, remote equipment, industrial remote control, etc., Manufacturer: DEWIN