Question:
If this new detector does not have a light to show movement, is there a chashash of a Shabat transgression when walked in front of it?
Answer:
Since you do not care about whether or not your motion is detected and it is non a certainty that you are always close enough for it to operate, therefore it is not a problem.
Sources:
O:CH 320:18 & 336:3 & Mishnah Berurah 24
