Alarm Lock

Actually, the castle served its purpose very well and acts only on the optics, even a deterrent to opportunist thieves.
Top somewhere a small GPS attach stickers in a bright color on the wheel.
With tools you have unfortunately destroyed the thing yet within 3 seconds.

For me, the alarm lock is still unfortunately not usable, it needs simply to be dug out the key for some time and has fumbled in the lock, which is not very smooth, to silence the alarm when you have that then made several times a day , makes itself a faint buzzing noise noticeable in the ears, at least my.

Get me to look for a similar castle but with remote control.