Does anyone know of a home security system that can work without electricity or a phone line?

I am in the process of rehabbing a house, but I have been robbed twice now and really want to get a security system, but so far the electrical and phone lines haven't been installed yet. Does anyone know of any type of alarm that would be able to work without electricity or a phone line? Maybe either battery... show more I am in the process of rehabbing a house, but I have been robbed twice now and really want to get a security system, but so far the electrical and phone lines haven't been installed yet. Does anyone know of any type of alarm that would be able to work without electricity or a phone line? Maybe either battery powered or something like that... Thanks!
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