Features： * brand new and high quality. *999 users can be authorized *Based on GSM network, widely used *Can be operated anywhere, no distance limit *Always detect the status of the door, illegal intrusion alarm *Use caller ID to identify unknown callers automatically *For remote control devices (doors, door posts, guardrails, garage doors, shutters and household appliances) APP control, providing remote control for users with different needs *SMS Smart Alert: Built-in 2-way digital input, when any trigger, will send a reminder message to the designated number, the whole family care, and immediately start the alarm, protect the assets for you through the GSM network. Specifications: Rated Voltage: 12VDC 1 A Working temperature: -10℃ to +60℃ Storage temperature: -20℃ to +60℃ Relative humidity: 10-90%, No condensation Work frequency: 900/1800MHz Communication protocol: GSM PHASE 2/2+ (include data service) Wired Zones: 2 Signal: 2G Related Voltage of the Output Relay: 6A/240V AC Size: 95*66*25mm/3.74*2.59*0.98in Package Includes: 1 X RTU5035 Gate Opener 1 X Antenna 1 X Card Pin Note: 1. Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item* 999 users can be authorized Based on GSM network, widely used Can be operated anywhere, no distance limit Always detect the status of the door, illegal intrusion alarm Use caller ID to identify unknown callers automatically