Smart Alarm -Door Opener Highlights Generic Brand Door Opener Description: The GSM/2G Door Opener Relay Switch is a device that can be used for authorized door access, security control, gates, switching remote equipment, parking systems in FREE call from your mobile phone. There are no call charges. Just dial the authorized user number at the specified time, then the barrier and doors are opened, or the machine is turned on or off by the gate opener / GSM / 2G relay switch. The closing or opening time of the relay is programmable. Up to 200 authorized phone numbers can be configured at the specified time. There is no need to provide remote control or keys for different users. Quad-band 850/900/1800/1900MHz can work in GSM/2G networks worldwide. Multiple applications: open/close sliding gates, sliding doors, gates, shutters, garage doors, locks with free call; microwave, air conditioner control; remote switching equipment, for example: street lights, solar energy, motor, pumps, fans, etc. specification: How does it work? A) Wiring the RTU5024 door opener with your locks or other machines. B) Insert the SIM card into the RTU5024 gate opener, power on. C) Send some SMS commands to the RTU5024 gate opener to assign the list of authorized users. D) Make a phone call from the authorized user's phone number. The RTU5024 door opener refuses the phone call and the door opens or closes. For example, if you use RTU5024 GSM Gate Opener to open/close your garage door by your family members, you only need 2-5 SMS commands. Material: metal Size: approx. 82x76x27mm / 3.22x2.99x1.06 inch GSM Frequency: 850/900/1800/1900MHz Digital Output: NC/NO dry contact, 3A/240VAC DC Power: 9-15VDC/2A Power Consumption: 12V input Max. 50mA / average 25mA SIM card: Standard SIM card Antenna: SMA 50 antenna interface Temperature range: -20~+60C Humidity range: 90% relative humidity Package includes: 1 main device 1 piece antenna 1 terminal User manual 1 piece