there is no notebook detector. it doesn't exist. you cannot find any fooking engineer anywhere in the world who can make a device to detect the presence of a hidden notebook that has been completely switched off.

the people who lost their notebook lost them because they didn't realise they are being watched from afar, by a group of people constantly on the lookout with binoculars, motorcycles etc. if the thieves are skillful enough to build a device to detect notebook, they should be skillful enough to break into car without smashing windows since those cars are normal Protons, cheap Toyotas with old, outdated door system that can be easily picked by veteran car thieves.

bottomline, cars got broken into all the time, especially cars that the owners has left their bags, boxes in them, regardless of whether they contain notebooks or not. as long as you got something in there that thieves can reasonably suspect to contain something valuable, your car will become a primary important target. period. end of story.

My car was broken into twice, both without the window being smashed, just because my friends left schoolbags and handbags left inside them and none of them contain notebooks.

the notebook detector is just a fooking myth, a story made up by the police as a stupid excuse for the inability to control the rampant theft situation.

as long as you got something in there that thieves can reasonably suspect to contain something valuable, your car will become a primary important target. period. end of story.