You can ask Alexa to turn on/off Sonoff 4CH Pro.

Standard voice control commands phrases for Sonoff 4CH and Sonoff 4CH Pro (if you just say the device name, Alexa will turn on/off all the 4 gangs immediately):

Alexa, turn on {deviceName}

Alexa, turn off {deviceName}

Alexa, turn on {deviceName} {gangName}

Alexa, turn off {deviceName} {gangName}

The default names for the 4 gangs are: outlet 1, outlet 2, outlet 3, outlet 4. You can change the name if you like.

Explanation: if the device name of your Sonoff 4CH is "My Switch", the gang name is "Outlet 1", then you can control with "Alexa, turn on My Switch Outlet 1".

* Turn on/off 4 home appliances remotely

* Supports switching among inching/interlock/self-locking modes

* Device status's synchronously display

* Single/Repeat/Countdown timers

* Share control

* Supports setting power on state

* 433MHz RF Remote control

* Works with Amazon Echo, Echo Dot, Amazon Tap

* Works with Google Home

* Works with Google Nest

Main function:

Remote ON/OFF----- Turn electrical devices on/off from anywhere

App Support ----- Free iOS and Android mobile App eWeLink

RF Remote control------ Turn on/off by 433MHz RF Remote indoors

Independent control------ Control each gang separately

3 Working Modes----- Switch among interlock/self-locking/inching modes

Adjustable Delay Time---- Turn on devices for 0.25-4s in Inching mode

DIN Rail Mounted--- Great for industrial control

Sync Status------ Real-time device status provided to App

Timing------ Set scheduled/countdown timers to turn on/off at specified time

Share Control---- Control your smart home together with your family

Scene---- Turn on/off a gang of devices with one tap

Smart Scene---- Triggered on/off by temperature, humidity or other environmental conditions

Voice Control ---- Works perfectly with Amazon Alexa, Google Home

parameters

Voltage range: 90-250v AC(50/60Hz) / 5-24V DC

Max current: 10A/gang

Max Power: 2200W/gang

Wireless Frequency: WiFi 2.4GHz 

Wireless Standard: 802.11 b/g/n & 433MHz

Security Mechanism: WPA-PSK/WPA2-PSK

Enclosure Material: Fire-retardant ABS V0

Gang: 4

Dimension：145*90*40 (mm)

Operating Temperature(recommended): 0ºC-40ºC(32°F-104°F)

Operating Humidity: 5%-90%RH, Non-condensing

CE/FCC/RoHS Certified

packing list

1.Sonoff 4CH Pro :

1* Sonoff 4CH Pro

1* Retailed Box

 2.Sonoff 4CH Pro with Control Remote:

1* Sonoff 4CH Pro