The Sonoff 4CH R3 is a 4-channel WiFi wireless switch that can control four home appliances and supports switching between 3 operating modes: interlock / self-lock / inching mode. This function allows you to let your switch turn on for a few seconds, but then turns off and acts as a pulse switch. It has a built-in 433.92MHz RF radio receiver, enabling them to be controlled by the RF remote control. Users can remotely enable / disable connected lights / devices from the eWeLink app for iOS / Android or with the 433MHz RF remote control. You can turn on single / repeat / countdown timers for automatic on / off at the set time. Timers can and do work even when the network is not available. To enable devices to be controlled by others, users can simply share the devices to other accounts and activate that timer.
Compatible with Amazon Alexa and Google Home.
Compatible Application: eWeLink
Specifications
Voltage Range: 100-240V AC 50/60Hz(DC: 9-23V)
Max. Load: 10A/2200W/Gang 40A/8800W/Total
Wireless Frequency: WiFi 2.4GHz
Wireless Standard: IEEE802.11 b/g/n 2.4GHz2.4GHz(2400M-2483.5M); 
Security Mechanism: WPA/WPA2
Enclosure Material: PCV0
Gang: 4
Dimension:145 x 90 x 34 (mm)
Operating Temperature(recommended): -10?C-40?C(14°F-104°F)
Operating Humidity: 5%-95%RH, Non-condensing
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