RTU5024 Mobile Remote Controller GSM Door Gate Opener Switch For Home Appliance 900/1800 MHz Features: This product is made of materials, durable, wear resistant and not easily damaged. Mobile phone APP whole process control, the interface is intuitive and easy to operate, and the functions are more abundant. The turn off or on time of the relay is programmable. Can be operated at will, no distance limit. It can also be used in places which require you to turn on/off your system, machines, or equipment remotely with a free call from your mobile phone. No call charges, the GSM GPRS trunk switch rejects the call from authorized number then carries out the turn ON/OFF action on the first 'ring'. A variety of applications for authorized access control, control doors, remote device switching and parking systems. Smart ID identification, hang up strange calls, up to 999 authorized phone numbers, can be configured at the specified time. Specifications: Condition: Material: plastic, electronic components Working temperature: -10 ° C - 60 ° C Storage temperature: -20 ° C - 60 ° C Relative humidity: 10-90%, no condensation Operating frequency: 900/1800 MHz Communication protocol: GSM phase 2/2 (including data services) Wired area: 2 Weight: Approx. 187g / 6.6oz Size: Approx. 12*9*2.8cm / 4.7*3.5*1.1in Package list: 1 * GSM Door Gate Opener Switch 1 * Antenna 1 * Card Holder 1 * English APP Manual Note:  1.Please allow 1-5mm error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.