Locks that work

I've had one of these for 3/4 months now, (you can get t with a slightly longer shackle which manages a tyre+seatstay) it does work great but it seems to use up juice even when unalarmed?!?!? i seem to replace the batteries every 6 weeks regardless whether i use it much or not. no warning if they're running out neither, activation beep goes off but not enough power for the sensor to be armed/alarm to go off.( replaced the batteries end of sept, just demonstrated to a friend and nothing happened... off to the pound shop....)

Purchased one of these off the bay, £15.
It beeps once when armed, it will also emit three warning beeps when first tampered with.
After that, it will be highly sensitive for 30 seconds, during which, breathing on the bike will sound the alarm.
It's pretty small and solid, fits on virtually any part of the bike bar maybe the rim.
Waterproof, good keys, batteries supplied for 3 years.

Been using it for a month or so along with a evo mini.. Could not recommend it more. Popping into the shops or the pub with this on the chainring gives me complete peace of mind.

It has been set off once, and the kid shat himself. I almost want to encourage someone to try and steal it just so i can run outside and crowbar them.

Get one.