I dont know what to call it to search it on google!
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I dont know what to call it to search it on google!
There are many devices that can detect a person approaching. You just need a wireless connection to get the signal to where you want it. There are many options at the link below. Just search for wireless burglar alarm components if you want your own search. You can use a burglar alarm sensor as just an announcer to let you know someone is coming.
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