Feature: 1. Double Probe: Water pipe detector adopts double probe design, including round probe and needle probe, which can be switched according to the site condition. 2. Working Principle: This audio device works by amplifying the vibration of the audio. The sound is a waveband, and depending on the size of the sound, this waveband will travel through short and long distances and be amplified by this device. 3. Rechargeable: Water pipe detector has built in battery, can be recharged and used repeatedly, small size and compact structure, can be carried around and used. 4. Scope of Application: Water leakage tester is for leak detection of water pipes, cement pipes, steel pipes and other kinds of constructed pipes. 5. ABS and Metal: Leak detector is made of ABS and metal, which is wear resistant and durable for long time use. Specification: Item Type: Pipe Leak Detector Material: ABS, Metal Weight: Approx. 370g / 13.1oz Size: Approx. 6 x 4cm / 2.4 x 1.6in Consumption Current: 15mA Battery: Lithium Battery (Ship with Inbuilt Battery) Battery Type: 18650 Battery Capacity: 1000mAh Probe Sensitivity: -10D db to -70D db Maximum Audio Amplification: 20,000 Times Penetration: Water Pipe, Cement Pipe, Steel Pipe. Package List: 1 x Pipe Leak Detector (Ship with Inbuilt Battery)1 x Plug1 x Round Probe1 x Needle Probe1 x USB Cable1 x Earphone1 x User Manual