The ultrasonic leak detector is designed to locate leaks in pressure and vacuum systems.It can be used to detect and locate the source of the ultrasonic emissiongenerated by gas or liquid flowing through a small restrictive opening. ltuses the advanced ultrasonic sensing technique and features small sizelight weight, reliable detection, easy use and utility. Power supplied by 2 pieces 9V, 6F22 battery (Battery Provided). Both the transmitter and detector require separate installation of batteries, and the positive and negative terminals of the batteries should be correctly installed. Frequency Response: 40kHz ±2kHz. Measure distance: Min.about 5cm, max.about 2-3 meters. Operating Condition: temperature: 0°C~40°C, relative humidity: When using, the transmitter must be placed inside the object being tested. For example, when measuring the airtightness of a car, it is necessary to place the transmitter inside the car and close the doors and windows. Then use the detector to track the exterior of the windows and door seals to locate the leak. This ultrasonic leak detector is not suitable for testing pipeline leaks, air conditioning leaks, or pool leaks, cabin leaks, etc. It can only be used for ultrasonic gas leaks; At the same time, this product is not suitable for low-pressure environments, such as not being able to detect air leaks in inflatable mattresses or hot tubs. If the air pressure is too low, the product may not function properly. This product includes adjustable headphone for detector, allowing you to work even in noisy environments. Includes a customized storage bag to protect the product from external damage and make it easy to carry when used outside.