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...or iOS and Android APP EweLink.Owning a [[Sonoff]] 4CH means you have 4 [[Sonoff]] basic WiFi switches integrate together. ...longs to [[Sonoff]] family, definitely, it bears all the functions basic [[Sonoff]] has. In EweLink, you can remote turn on/off from anywhere at any time, se

...turn on connected devices for 0.25-4s(Sonoff 4CH Pro) or 1-16s (Sonoff 4CH Pro R2). In interlock mode, users can turn on 1 device every time, and turn off [[Sonoff]] 4CH Pro is hacker-friendly! You can flash external firmware!