Automatic Door Opener Relay Switch - GSM 2G Phone/Call Remote for Smart Home Garage (Up to 999 Authorized Numbers)

Control doors and garage openers by phone with this relay switch designed for smart home use. It can store up to 999 authorized phone numbers and uses Caller ID to verify callers — unknown numbers are ignored for added safety. Technical specifications: - Working temperature: -10°C to +60°C - Storage temperature: -20°C to +60°C - Relative humidity: 10-90%, non-condensing - Working frequency: 900/1800MHz - Communication protocol: GSM PHASE 2/2+ (including data services) - Wired Zones: 2 - Signal: 2G - Weight: 200 grams - Dimensions: 95*66*25mm/3.74*2.59*0.98 inches