Cheap Alarm

[dicktheleg]

I bought one of these to put on my e-bike when fixed to the back of the motorhome, impressed by it I’ve now put one on each of my bikes.

They’re sensitive, loud and very cost effective.

Won’t stop anyone determined to nick your bike but every little helps.

 

[Morety]

Biggest advantage with these: They won't drain your bike's battery.
Biggest disadvantage: If spotted, they'd be ripped off in seconds.

I guess if tucked or fitted inside some panelling that needed a torx wrench to remove it, it would slow them up, or even under a locking seat.