Feature: 1. High Performance: The leak detector has the characteristics of high sensitive sensing, noise filtering, metal body, 4 gears adjustment and test depth of 1‑1.5m (The test depth is related to the pipe pressure). 2. Better Listening Effect: The external network sensor has good listening effect and accurate judgment, which is suitable for outdoor use and can shield external noise, obtain good listening effect to make accurate judgment. 3. More Accurate Positioning: The leak detector can achieve accurate positioning, break through the shackles of traditional leak detection instruments, and achieve more accurate positioning. 4. Easy to Use: The higher the value, the closer to the leakage point, and different leakage points can be captured. Counterclockwise rotation reduces the display sensitivity, and clockwise rotation increases the display sensitivity. 5. Wide Applicability: The leakage monitor can be widely used in fire pipes, floor heating pipes, household pipes, automobile abnormal noise and other purposes. The high sensitivity chip widens the exploration frequency range to 200HZ‑3000HZ and improves work efficiency. Specification: Item Type: Leak detector Material: Stainless steel, PP Weight: Approx. 3400g/119.9oz Frequency Range: 200-3000HZ Magnification: 0-100db adjustable Frequency Grading: 1-4 gears HZ continuously adjustable Operating Current: 30mA Battery Type: Lithium battery(Built in) Battery Model: 18650 Battery Capacity: 1600mAh Operating Temperature: -10℃ - +50℃ Working Time: >30 hours. Package List: 1 x Leak Detector1 x Storage Box1 x Extranet Sensor1 x Indoor Sensor1 x Silencing Handle Switch1 x Power Cord1 x Headset2 x Key1 x Stethoscope1 x English Instructions