【Independently/Mutual Control 4 Devices】Turn on/off the 4 connected devices separately in self-locking mode. Turn on 1 device but turn off the other 3 devices at the same time in interlock mode. Turn on the connected devices but automatically switch off after 0.5-3600s later in inching mode.
【[Dry Contact】If your device does not need to be powered through the output of the 4CHPROR3, but only needs to use it as a smart switch to control the line on and off, the 4CHPROR3 is your best choice.
【With 433MHz RF Control】Use your common 433MHz remote control to turn on/off the device without internet.
【Easy To Out-of-Reach Devices】Mounted on the guide rail, convenient to connect and control devices far from the switch.
【Works With Alexa & Google Assistant & SmartThings & Alice】You can directly ask Amazon Echo/Echo Dot/Amazon Tap, Google Home to turn on/off your SONOFF devices.