Yes, you can!
You can connect up to 6 control boxes with a single remote. This allows you to control a maximum of 6 pergolas simultaneously within a range of up to 40 meters from the remote.
Please note that the range decreases to 20 meters if there are two 20 cm-thick concrete walls between the remote and the control box.
If you have an additional heat controller for another heat lamp, the number of connectable control boxes will decrease to 5 control boxes + 1 heat controller.