Why choose Fdit? It has strong practicability and is suitable for water leakage detection of various construction pipelines. Detect pipe leakage by amplifying the sound, with headphones, you can adjust the sound level. Dual probe design, including circular probe and needle probe, can be switched according to the site conditions. Built‑in 3.7V lithium battery, which can be recharged repeatedly, which is convenient to use. Made of high‑quality ABS and metal, wear‑resistant and durable, not easy to damage. Package List: 1 x Host Detector 1 x Plug 1 x Circular Probe 1 x Needle Probe 1 x USB Cable 1 x Headphone 1 x Instruction Specification: Material: ABS + Metal Weight: Approx. 380g/13.4oz Product Size: Approx. 6 x 4 x 2cm/2.4 x 1.6 x 0.8in Consuming Current: 15mAh Use Battery: Lithium Battery 3.7V Batteries (Built-in Battery) Probe Sensitivity: -10D db- -70D db Maximum Audio Amplification Factor: 20000X Penetrability: Pipe/ Cement Pipe/ Steel Pipe Answering Method: Earphone can be connected with 16 ohm speaker Effective depth of leakage detection: within 1 meter Instructions for use: 1. Insert the probe or probe into the audio input jack 2. Insert the earphone into the audio output jack 3. The red light is on when charging, and the red light is off when completely charged FAQ Q: How deep can it detect leaks? A: Within 1 meter.