Maybe you entered a wrong wi fi ssid and password.
Sonoff 4 channel wifi smart switch.
The led indicator flashes twice on repeated means you fail to connect to the server.
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It integrates with a 433mhz rf receiver module making it possible for the switch to be controlled by rf remote.
Each channel can pair 1 remote controller button.
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The sonoff 4ch pro smart switch is din rail mounted.
Maybe your router has a lower carrying capacity.
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Users can remotely turn on off the connected lights appliances by ios android app ewelink or 433mhz rf remote.
Sonoff 4ch pro is a 4 channel din rail mounting 433mhz rf remote wifi switch that can independently control the 4 home appliances.
In ewelink you can remote turn on off from anywhere at any time set single repeat countdown timing schedules to turn on off at a specified time share to others so that they can control together.
Be sure that the mac of the device is not in the black list of your mac management.
They can create 8 enabled.
Quickly press the channel button that you want to pair twice on sonoff switch and press any button on the rm433 4 button 433mhz rf remote then the led indicator of corresponding channel on sonoff switch flashes 4 times on repeated after successful pairing.
Compared with 4chr2 there are extra features including self inching interlock inching mode and rm433 control for 4chpror2.
It supports switching among 3 working modes.
It supports switching among 3 working modes.
Sonoff 4ch pro is a 4 gang wifi switch.
Sonoff 4chr2 pror2 4 gang 433mhz rf remote wifi light switch 4chr2 pror2 wi fi smart switch both are made to control up to 4 different devices remotely.
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Sonoff 4ch r2 4 gang wifi light switch belongs to sonoff family definitely it bears all the functions basic sonoff has.