how bout one of those notification alarms that you plant outside your door to tell you someone has come up the driveway...it just goes ding but it would let you know someone has stepped up there...I think it's fairly water proof since it's designed to be outside...
cost is about 20 bucks from harbor freight.com
SP
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Don't compare your life to others. You have no idea what their journey is all about. 
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SSN683 Association member 
Par Excellence
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2008 Bayliner 340 - "Wild Whim"
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I live in my own little world....but it's okay-they know me here!!! 
Avid practitioner of the martial art: KLIK-PAO. 
Tap-Rack-Bang
Anyone that sez "Size doesn't matter" has never owned a boat!
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alarms
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