The latest model of Sonoff's internet-controllable relay switches, the Sonoff Basic R4, is a smart switch relay that is an entry-level model of the Sonoff Basic R2. It also works with Sonoff's eWeLink-Remote remote controllers (Sonoff S-MATE / S-MATE2 modules, R5 wireless switch), which is a new feature. This relay switch module can be used to turn on and off electrical appliances and supports WiFi and Bluetooth. It requires a 230V AC power source. You can remotely operate the switch and program an on/off time using an app that runs on an iOS (Apple) or Android smartphone with an Internet connection. Naturally, the relay also has a physical push-button switch. Additionally, family members can share the mobile app's remote access feature. Ideal for intelligent