Description Sonoff G1(via GPRS network) Sonoff G1 is a GSM smart power switch that allows users to remotely turn on/off any connected appliances by Android and iOS app eWeLink via GPRS network. Different from other Sonoff products that have to connect to WiFi or LAN, G1 supports to be inserted with a SIM card (GSM/GPRS:800/900/1800/1900MHz) and use the 2G GPRS network to control connected appliances. The 3G and 4G card can also work on 2G network. Please make sure your area has covered with stable 2G network signal. Users can apply the wireless switch to modern agriculture like greenhouse light control, watering machine, oxygen pump. They can also apply the smart switch to pet feeding control, server room control, roller shutter, etc. Note: Some countries have stopped providing with 2G networks, like America, Australia. And some SIM cards don't allow 2G network. Support SIM Card–GSM/GPRS:800/900/1800/1900MHz Control with GPRS data–Communicate with Cloud over GPRS network, no WiFi needed Remote ON/OFF–Turn electrical devices on/off from anywhere App Support –Free iOS and Android mobile App eWeLink Sync Status–Real-time device status provided to App Timing–Set scheduled/countdown timers to turn on/off at specified time Share Control– Control your smart home together with your family Scene–Turn on/off a gang of devices with one tap Smart Scene–Triggered on/off by temp, hum or other environmental conditions from sensor Wide Applications –modern agriculture, pet feeding, server room control, roller shutter, etc. Compatibility –Works perfectly with Amazon Alexa, Google Assistant, IFTTT, Google Nest