# Other commands
## ctl command
The command enables managing the unit’s built-in heater (optional).
Syntax:
```
ctl [heater threshold|on|off [[no]log]]
```
* "*threshold" -* heater enable temperature ( -15...-1 )
The Astra Wireless units can be supplied with a built-in heater to enable their operation in very low temperatures and arctic conditions. Such units also has a built-in sensor for the inside temperature.
“c*tl*” command executed with no additional parameters shows the current temperature inside the unit in Celsius.
“c*tl heater threshold*” command sets a threshold for the temperature under which the built-in heater is turned on. The range of the threshold temperature varies between -15 and -1 degrees Celsius. For example:
```
ctl heater threshold -10
```
“*Ctl heater on/off*” command turns on or off the heater:
```
ctl heater on
```
“*Log*” option enables registering heater operation events for the sensor in the system log. To disable logging a “*nolog*” option is used.
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