The Urosensor is put inside a mini-pad or pantyliner. Take any inexpensive mini-pad or pantyliner and cut a 1 inch slit in the absorbing layers towards the top or bottom edge of the mini-pad or pantyliner. The mini-pad provides a collecting area that is even wider than the Urosensor so it quickly catches the urine and directs it onto the sensor. The Urosensor works well with a pull-up, too. If you prefer not to use the mini-pad, the sensor can also be placed in between two pairs of underwear.