Features 1、*Increased antenna control, more stable signal, security precautions no longer dropped. 2、*850/900/1800/1900MHz quad bands, can work in the worldwide GSM networks. 3、*No call charges. The GSM Relay Switch answers the call from authorized number then carries out the turn ON/OFF action on the first /u0027ring/u0027. Specifications Overview: This GSM gate opener features remote on/off switch by authorized phone free calls, which can be operated from anywhere, no distance limit, very convenient. Features: *Increased antenna control, more stable signal, security precautions no longer dropped. *850/900/1800/1900MHz quad bands, can work in the worldwide GSM networks. *No call charges. The GSM Relay Switch answers the call from authorized number then carries out the turn ON/OFF action on the first 'ring'. *Secure - Using caller-ID for identification, unknown callers are ignored. *Add or remove users by SMS Text command. *No need to provide a remote control or keys for different users. *Up to 200 authorized phone numbers can be configured at the specified time. *The relay action will return a SMS confirmation to the owner or authorized call in number, this function is editable by user. *The relay close or open time is programmable. *Multiple applications. (Gates, bollards, barriers, garage doors, shutters and access doors or machines). Specifications: GSM Frequency: 850/900/1800/1900MHz Digital Output: NC/NO dry contact, 3A/240VAC DC Power Supply: 9-24V DC/2A Power Consumption: 12V input Max. 50mA/Average 25mA SIM Card: Standard SIM Card Antenna: 50Ω SMA Antenna interface Temperature Range: -20~+60°C Humidity Range: Relative humidity 90% Dimensions: Approx. 3.23*2.99*1.06in / 82*76*27mm Package Size: Approx. 19.8*11.2*3cm / 7.79*4.40*1.18cm Package Weight: Approx. 9.27oz / 263g Package List: 1 * GSM Door Opener 1 * Antenna 1 * User Manual Card Package List 1 * GSM Door Opener 1 * Antenna 1 * User Manual Card Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!