For leak detection: Just place the sensor (suction cup up) at the lowest point of the floor or other horizontal surface where water collects. The alarm will sound if water bridges between the two contacts. Alarm can be table shelf or wall mounted away from the sensor For unattended filling of bathtubs pools spas etc: Use the section cup to attach the sensor to any smooth vertical surface. The buzzer will sound when the water reaches both metal contacts on the sensor
(Sonin 700)