Feature:1. Good Features: Equipped with LCD, noise reduction switch (bounce to filter some noise), switch, headphone jack, charging jack and sensor jack.2. On Screen Display Knob: Turn counterclockwise to decrease display sensitivity, and clockwise to increase display sensitivity.3. Reliable Performance: Frequency selection switch (200‑300Hz). Volume adjustment knob. Sensor handle with switch control design, easy to use.4. Battery Type and Host Size: Lithium ion battery, model 523412, 8.4V, capacity 1000mAh. Host size is18.5x11.3x8.5cm / 7.3x4.4x3.3in.5. Product Parameters: The magnification is from 0‑100dB. Frequency binning 1‑4 files 200HZ‑3000HZ continuously . Working current 60mA.Specification:Item Type: Electronic Leak DetectorMaterial: IronColor: As Pictures ShownWeight: Approx. 6.250kg / 13.85lbVoltage: 100-240VMeasurement Object: Pressurized PipelineBattery: Lithium ion Battery, Model 523412, 8.4V Capacity 1000mah (Shipped with Built in Battery)Host Product Size: Approx. 18.5x11.3x8.5cm / 7.3x4.4x3.3inA: The magnification is from 0-100dB.B: Frequency binning 1-4 files 200HZ-3000HZ continuously .C: Working current 60mAD: Voltage 9 voltsE: Operating temperature -10℃~+50℃F: Working time > 30 hourHow to Use:Sensor handle:When the sensor is moved, the sound of pressing the button disappears to avoid strong sound impact to hearing.1: Outdoor sensor selection switch, press 0 to turn on the normal sensitivity sensor in the sensor, press to turn on the high sensitivity sensor in the sensor.2: The mute switch, the sound in the earphone disappears when it is pressed, and the sound recovers when it is bounced.External sensor: special for outdoor pipeline leak detection, built in ordinary sensor and high sensitivity sensor, select high sensitivity sensor to detect deeper water leakage points.Listening rod: used with external network sensor,