[Independently control 4 devices] : It is the new 4-channel design which can make you remotely turn on/off 4 home appliances independently. [3 powerful working modes] : Turn on/off the 4 connected devices separately in self-locking mode. Turn on 1 device but turn off 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. [Quick to Access 3 Working Modes] : Compared with 4CHPROR2, you can access self-locking, interlock and inching mode on APP directly. [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 Home,IFTTT Supporting]: Link "EWeLink Smart Home Fan" skill. You can directly ask Amazon Echo/Echo Dot/Amazon Tap to turn on/off your Sonoff devices.Link "Smart We Link" on Google Home app, start to voice control your Sonoff devices on Google Home.