Tilt alarm/small standalone box alarm

[Bloke]

I'm looking for a simple standalone tilt/vibration alarm unit. Something that when I'm at home I can shove under my bike cover on the engine and it'll pick up a knock or basic movement and set off something similar to a personal attack alarm.

Reason: I'm pretty sure my next door neighbor is screwing with my bike trying to move it or trying to take a peek under the cover (cover is locked to bike) when he thinks I'm asleep or on the weekends.

I want to catch him so I can ask why he's fiddling with it. Don't want to fit an alarm as they just drain the battery but a small unit I can just put on it to:
a. Scare the crap out of him
b. Grab my attention. (it's bang outside my house)

Anyone have one? I could just make one out of a rape alarm (replace lanyard with reed switch and latch) but would be easier to just buy one ready made.
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2008 VFR800 VTEC

[Moo.]

Hmm.. You can get knock alarmed disk locks.. if you balanced this on the engine somewhere, so when moved it falls off. I have one, god its loud..
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A2 Passed 18/6/10

[Bloke]

Yeah but that's £60 I was thinking a box of tricks costing about a tenner

Might knock one up but thought it might be one of those things folk find on ebay.
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2008 VFR800 VTEC

[Moo.]

Im sure it wouldnt be too hard to rig up your own alarm to the bottom on the bike cover, something like when it gets pulled apart, completes the circuit, alarm goes off
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A2 Passed 18/6/10

[Pie-Roe]

[Bloke]

Just bought this:
https://cgi.ebay.co.uk/Brand-New-High-Quality-Cavius-4-in-1-Personal-Alarm_W0QQitemZ280558680909QQcategoryZ102536QQvarZQQcmdZViewItem

Will pick up motion of my bike and can be thrown in a bag for touring, or used on my tent and even does smoke detection kinda neat for touring as well as my primary need to say "oi wtf do you think you are doing?" to my neighbour.
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2008 VFR800 VTEC

[Derivative]

Baby monitor?

Edit: missed the above post