Baby Scientific

Bagel has found a new calling. He has decided to become a scientific instrument called a Mommy Proximity Detector. If his mommy goes out of range, his cry alarm goes off. Unfortunately, his proximity radius knob seems to be stuck at 1 foot for the last couple of days. If you have experience with Mommy Proximity Detectors, do you know where I can find the proximity radius knob? I'm thinking it might be at the bottom of a bottle of liquid Benadryl.