SPBS5 Parking Radar working distance

Hi! this is my first post!
i bought your SPBS5 Parking Radar,
after i installed it i noticed that the working distance is so far,
it makes the continous peeee from around 30 cms to 0.
I think its not helfull if you are parking in a small place with another car or obstacle behind you,
my question is,
is possible to modify this working distance?
i mean reduce it! would be great if the continous peee was activated around 15-10 cms from the obstacle,
i was wondering if its possible to modify the internal electronic circuit of control / main unit to achive thie objetive?
thanks!
sergio

This forum is for Velleman Projects products only. However, I do not see anything in the manual that indicates that the ranges can be adjusted