Backing 2009 my wheelchair was stolen and trashed. After this I started looking into alarm systems and found a company called DataTool who make alarm systems for motorbikes. They told me they had a system that will work on the wheelchair and offered to send me one, the Deamon Evo.
One thing I like about it is that it has a built in panic alarm. So if I feel insecure threat when I’m out alone I can set off the alarm. It also has a trigger wire so you can add a pressure sensor under the seat. Then if someone sits sn the seat it will trigger the alarm.