35R tested against swedish speed cameras

I have been using it driving on par example the road from E4 to Motala in Sweden. On this road there is a lot of speed cameras. The 35R warns me up to app 1km before, even if the speed camera is behind several bends and is hidden behind a hill or buildings. I get amble warning, very impressive. I've been using it in Denmark also, but not had as many proofs of its efficiency here in the period. Only problem is that it is now not working anymore and my local electro-technician cant find out why. I bought it in US in 2002 and it worked until 2006.