High quality sonoff 4ch is an esp8285 based 4 channel (4-gang) din rail mounting wifi switch. sonoff 4ch supports to connect and control 4 home appliances, which can be turned on/off separately by the buttons or ios and android app ewelink. owning a sonoff 4ch means you have 4 sonoff basic wifi switches integrate together. the enclosure is din rail mount supported! a din rail is a metal rail of a standard type widely used for mounting circuit breakers and industrial control equipment inside equipment racks. it bears all the functions basic sonoff has. 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. sonoff 4ch is hacker-friendly that you can flash your firmware without