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Sonoff 4CH Pro Multichannel 433MHz RF and WiFi Smart Switch with Inching Interlock and Self-locking

Sonoff 4CH Pro is a 4-gang RF and WiFi switch. They support switching among 3 working modes: interlock/self-locking/inching mode, and both supports to set 1-16s delay in inching mode. This feature allows you to let your switch turn on for a few seconds th..