Garage Door Openers descriptions： We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. Gsm Gate Opener Switch, Remote Access Controller For Automatic Sliding Door,. Features: Default GSM Quad-band, Can Work in the Worldwide GSM Networks, Optional 3G or 4G. No Call Charges. The GSM Gate Opener/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. Add or Remove Users by SMS Text Command. Up to 200 Authorized Phone Numbers Can Be Configured at the Specified Time. One Output with Relay Rating 3A/240VAC for Connecting the Switch of the Door or Machines. Specifications: Model Number: RTU5034 Security Mode: Fail Safe Direction: None Name: Remote Access Control Unit Power Supply: DC 12V/1A Frequency Range: 850/900/1800/1900MHz SIM Card: Supporting 3V SIM Card Authorized Phone Numbers: Max 200 Size: 90*70*27mm Package List: Package A: RTU5034*1, Single Antenna*1 Package B: RTU5034*1, Single Antenna*1,Power Adaptor*1 Package C: RTU5034*1, 3M Extend antenna*1 Package D: RTU5034*1, extend antenna*1,Power Adaptor*1 . Products number : SOMONO87452