Feature:1. Remote Control: The GSM gate opener comes with a remote on off switch for authorized calls for free calls, which can be operated from anywhere without distance restrictions. It operates with a frequency of 850 900 1800 1900 MHz, making it suitable for GSM networks worldwide.2. High Performance: The GSM remote controller is built with a metal casing and IP30 protection rating. It is specifically designed for industrial control applications, providing a secure isolation system.3. Unlimited Distance Control: With GSM control, you can control the device anytime and anywhere, and receive alarm notifications at any time and from anywhere globally.4. Wide Application: Relay controller is suitable for various scenarios and applications, such as farming and agricultural power equipment, factory automation, base station lighting, urban appearance, etc.5. Compact Size: The GSM door opener is very compact, making it a perfect gift for friends or family members with a similar need. The small size adds to its convenience, portability and easy installation.Specification:Item Type: Relay SwitchMaterial: AluminumGSM Frequency: 850 900 1800 1900MhzSIM Interface: Standard SMA interfaceOutput: Normally On and Normally OffWeight: Approx. 371g/13.1oz.Package List:1 xRelay Switch 1 x Manual1 x Signal Cable1 x Plug