SONOFF WiFi Smart Switch 4CHR3Easy access to 3 modes of device operation Unlike the previous version of the Sonoff 4CHR2 switch, we have access to Self locking (allows you to turn on devices that will remain on until you manually turn them off), interlock (when you turn on a second device, another device that was previously turned on is automatically turned off) and inching (when you turn on a device, it is turned off after a predetermined time) modes directly through the app on
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