Feature: 1. Fine Workmanship: This professional leak detector has fine workmanship and is a sophisticated professional instrument that can accurately and efficiently detect leaks. 2. Working Principle: The working principle of the instrument is to rely on the shock wave of the physical sound source to transmit the sound and gradually amplify the sound until it can be heard normally. 3. Strong Sensitivity: This leakage detector has superior performance, strong sensitivity, one second leakage detection, is imported components. 4. Clear Sound Quality: The audio of leakage is amplified by 25000 times, high definition sound quality, can capture smaller sounds. 5. Four Gear Adjustment: This detector has four gears that can be adjusted, and different gears can be used according to different situations to meet different conditions. Specification: Item Type: Leak Detector Material: Stainless Steel and PP Gross Weight: 1373g / 48.4oz Battery Type: Lithium Battery(included) Voltage: 9V Making Models: 6F22 Battery Capacity: 300MAH Working Time: 10-23 hours (depending on sound strength) Four Audio Selections: 3 gear(100Hz-700Hz), 2 gear(700Hz-900Hz), 1 gear(900Hz-100Hz), 0 gear(1100Hz-1600Hz) Probe Sensitivity: -60db Audio Magnification: 25000 times Maximum depth of detection: 1 m/39.4in. Package List: 1 x Host1 x Probe1 x Headphone1 x Chinese Japanese Manual1 x Storage Box Note: The probe must be slippy contact surface, contact please do not drag the probe parallel, so as not to damage the probe, with the probe, adjust the audio gear knob 0, 1, 2, 3 to mediate the best effect, the volume knob to coordinate with the mediation of conventional 3 gear.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.