The Ultrasonic Podhas 2 sensors onboardm one on each side.   It will detect ditrection and distance on each side.  Ultrasonic Pod will alert you with audio as well as visuals. The sensor will beep more often the closer the energy is to it and beep less often the further away the object is. It will tell you whether the energy is on the left or right side or maybe both sides. This requires ine 9v battery. Just Power on, then set where its not detecting any walls, or any object within the 6 ft range.