Feature: 1. FREQUENCY RANGE: The water leakage detector adopts high sensitivity chip, with a detection frequency range of 200HZ‑3000HZ, with 4 levels adjustment. 2. MAIN FUNCTION: Can detect noise from pipeline leakage sources, determine the location, wear headphones to detect, 0‑100db adjustable magnification. 3. EASY OPERATION: With external earphone sensors to block external noise, with good listening effect and accurate judgment, suitable for noisy environments. 4. LEAK POINT DETECTION: The higher the value, the closer to the leak point, can catch different leak points, turn counterclockwise to reduce the display sensitivity, clockwise to increase. 5. BATTERY POWERED: The underground water leakage detector has a built in 1000mAh lithium ion battery, working time of 30 hours, making it safe to use outdoors. Specification: Item Type: Water Leakage Detector Current: 30mA Magnification: 0-100db Adjustable Operating Temperature: -10-50℃ Working Hours: >30 Hours Frequency: 1-4 Levels 200HZ-3000HZ Continuously Adjustable Battery: 523412 8.4V Lithium Ion Battery 1000mAh Capacity (built in battery). Package List: 1 x Detection Host1 x Headphone3 x Sensors1 x Sensor Handle1 x Power Adapter1 x Storage Bag1 x Carrying Case