The air safe is a Lock-Out Plug which will effectively secure any power wheelchair as unusable, by directly plugging in a small device which blocks the power to the wheelchair which eliminates the need for the wheelchair battery to be disconnected for air travel and then by merely unplugging the little tool you can begin to use your wheelchair again.
It is also beneficial if you need to leave your power wheelchair unattended in a public place as it will disable the wheelchair making it difficult for it to be used for joyrides or be taken.