Sonoff 433MHz DIY WiFi Smart Wireless Remote Control Timer Module Power Switch with 4-keys Remote Control for Smart Home, Support iOS and Android 1. Compatible with Alexa and Google Home to manage your devices. 2. RF switch is a Sonoff version with a 433MHz RF receiver module inside.This wireless switch can be used together with the RF remote controller, which enables you to control appliances in indoor environment. 3. The remote control switch allows users remote turn onoff connected appliances via app eWeLink from anywhere in the world. 4. Sonoff transmits data to a cloud platform through the Wi-Fi Router, which enables you to remotely control the connected appliances, via free eWeLink App. You can download the iOS version in App Store and the Android version in Google Play. The App eWeLink enables you to control your devices easily. 5. Share control with your family and friends. Also you can DIY set this buy yourself easy handling and can be activated immediately and stably. 6. Timing function: Another feature available if to set timing schedules for the appliances, which can include countdown, scheduled onoff . It's simple, giving you one less thing to worry about in your busy life.