Yes, opening and closing degree control are supported in Homekit version now. For Non-Homekit version, we only support Up/Down and Stop operations.
Yes, smart roller shutter timer is compatible with Amazon Alexa, Google Home and SmartThings. Below is typical voice commands:
Alexa
To fully open the blinds:
"Alexa, <blind> up"
“Alexa, turn off <blind>”
“Alexa, set <blind> off”
"Alexa, increase <blind>"
"Alexa, set <blind> to 0%"
To fully close the blinds:
"Alexa, <blind> down"
“Alexa, turn on <blind>”
“Alexa, set <blind> on”
"Alexa, decrease <blind>"
"Alexa, set <blind> to 100%"
Set the blind to a certain position:
"Alexa, set <blind> to 50%"
"Alexa, increase <blind> by 50%"
"Alexa, decrease <blind> by 50%"
Google Home
Open:
"Hey Google, turn off <blind>"
"Hey Google, set <blind> off"
"Hey Google, set <blind> to 0%"
Close:
"Hey Google, turn on <blind>"
"Hey Google, set <blind> on"
"Hey Google, set <blind> to 100%"
Set the blind to a desired position:
"Hey Google, set <blind> to 50%"