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You can buya wrieless contactor for alarm systems at Lowes. I bought some a couple years ago. GE made a system and they sold spare wireless contactors you can add to most systems. I have some of them that are going on 2 1/2 years on the same battery.
They make several types. FOr your Vacuum, one like you use on a door or window that has 2 parts would work. WHen the door is closed the 2 magnetic contactors are close to each other and when the door opens it breaks the circuit and activates the sensor. What ever brand of alarm system you use should make these wireless sensors. I have seen that any of the professional alarm companies are now using these on their systems.