What the heck. For 7 bucks & free shipping, I'm in. Not like I need to bump up the goof / dork factor any more here, but another layer of deterrence and alert strikes me as a good thing. This doo-dad, my front wheel's velo orange skewer, and a quick and simple u-lock while I go in to run an errand (out of immediate sight but probably not ear shot) sounds like a nice multimedia strategy.