Feature: 1. External Network Sensor: The external network sensor is suitable for outdoor use, can shield external noise, obtain better listening effect, and make accurate judgments. 2. Indoor Sensor: The indoor sensor is small size, high sensitivity, suitable for indoor use, more suitable for use in small spaces. 3. Noise Cancelling Handle Switch: When the sensor is moved, the sound of pressing the button disappears, avoiding strong sound impact and protecting hearing. 4. Zinc Alloy: This pipe water leakage detector is made of premium zinc alloy material so that it is strong, durable and has long service life. 5. Widely Applicable: The water leakage sensor can be widely used in fire pipelines, floor heating pipelines, household pipelines, abnormal noise of automobiles, etc. Specification: Item Type: Pipe Water Leakage Detector Material: Zinc alloy Gross Weight: 3445g/121.5oz Product Size: 16.7x11.7x8.8cm/6.6x4.6x3.5in Battery: Lithium battery, model EPT773362 2S capacity 1600mah,delivered with built in battery Magnification: 0 to 100dB adjustable Frequency: The frequency is divided into 1to 4 grades 200HZ to 3000Hz continuously adjustable. Working Current: 30mA Operating Temperature: -10℃ to +50℃ Working Hours: 30 hours. Package List: 1 x Host 1 x Sensor Head1 x External Network Sensor1 x Indoor Sensor1 x Handle1 x Earphone1 x Charger2 x Key1 x Aluminum Case1 x Manual Note: 1. Do not put water into the instrument.2. Do not disassemble and touch the internal components at will.3. Do not vibrate strongly.4. When not in use for a long time, it should be put into the instrument packing box for storage.5. Turn off the power when charging to avoid damage to the instrument.