Product Review

Sonoff Dual is a WiFi based 2 gang switch that can connect and control two home appliances or electrical devices independently.
You can ask Alexa to turn on/off Sonoff Dual. Standard voice control commands phrases for Sonoff Dual (if you just say the device name, Alexa will turn on/off all the 2 gangs immediately):
Alexa, turn on {deviceName}
Alexa, turn off {deviceName}
Alexa, turn on {deviceName} {gangName}
Alexa, turn off {deviceName} {gangName}
Explanation: if the device name of your Sonoff Dual
is "My Switch", the gang name is "Gang 1", then you can control with "Alexa, turn on My Switch Gang 1".
Features

Remote turn on/off through the APP EWeLink
Independently control 2 devices in APP EWeLink
Supports tracking device status on EWeLink
Supports setting countdown, single and repeat
timing tasks
Works with Amazon Echo, Echo Dot, Amazon Tap
Works with Google Home
Works with Google Nest
Specification

Power Supply: 90-250V AC
Max Current: 16A(2 gang),10A(1 gang)
Max Power: 3500W(2 gang) / 2200W(1 gang)
Product Dimensions: 114*52*32mm
Color: White
Frequency: 802.11 b/g/n
Security Mechanism: WPA-PSK/WPA2-PSK
Humidity: 5%-90%RH, Non-condensing
Enclosure Material: Fire-retardant ABS V0
Operating Temperature: 0ºC-40ºC(32°F-104°F)
Gang: 2
Certification: CE, RoHS, FCC

Package
1*Sonoff Dual Similiar product:
Cheaper choice 10A wifi switch:
https://www.amazon.com/dp/B078JHCB3Z
Wifi Light:
https://www.amazon.com/dp/B075JTF81P