Add or remove users via SMS text commands. Relay close or open time is programmable. Can be operated anywhere, no distance restrictions.Quad-band, can be used in the global GSM network. No need for remotes or buttons for different users.Safe - use caller ID for identification, unknown callers will be ignored. Up to 200 authorized phone numbers can be configured at a given time.One output with a relay rating of 3A/240VAC for connecting a door or machine switch. multiple applications. (doors, bollards, barriers, garage doors, shutters and access doors or machines).The relay action will return an SMS confirmation to the owner or authorized phone, this feature can be edited by the user. No call charges. The GSM GPRS trunk exchange rejects calls from authorized numbers and then performs an open/close operation on the first "ring".The GSM door opener is a powerful GSM relay that can be used for authorized access control, control doors, switching of remote devices and parking systems.Also, it can be used where a system, machine or device needs to be turned on/off remotely with free calls from your cell phone.GSM frequency: Quad-band 850/900/1800/1900MHzNetwork: 2GOutput: NC/NO dry contact, 3A/250VACDC power supply: 9-24VDC/2APower consumption: 12V input maximum 50mA / average 25mASIM card: Support 3V SIM cardAntenna: 50ΩSMA antenna interfaceTemperature range: -20-60℃Humidity range: 90% relative humidityDimensions: 96.5x50x31.5mm/3.8x1.97x1.24inchcolor:BlackMaterial:plasticPackage Contents:4 x GSM door openerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.About UsWe provide the good product with the best price,we support Wholesale/Drop Shipping Order1. For Drop Shipping order, please remark"dropshipping order", we will prioritize it.2. For Wholesale/Drop Shipping orders, if you have any ideas about the price or package,please contact us in advance,we will give you the best service to satisfy your demands.About Shipments1.We will send out the orders ASAP once your payment is completed normally.2.Please write your complete delivery address with correct phone number and zip code, especially please confirm your full name.About After-sale ServiceWe are reliable seller and we have our professional after-sale service for all of our customs. If there is any question about the order,please contact us in advance ,we will always here until you get a happy answer.About Feedback1. Please check the package and item when you get carefully to make sure there is no problem.2. If you have any problem or are not entirely satisfied with your package,please don’t be hesitate to contact us first before leaving negative feedback. We will resolve the problem to satisfy you.6134. If there is no problem, please leave us five star positive feedback.Your affirmation is our greatest motivation ! !