1It has strong practicability and is suitable for water leakage detection of various construction pipelines. 2Detect pipe leakage by amplifying the sound, with headphones, you can adjust the sound level. 3Dual probe design, including circular probe and needle probe, can be switched according to the site conditions. 4Builtin 3.7V lithium battery, which can be recharged repeatedly, which is convenient to use. 5Made of high-quality ABS and metal, wear-resistant and durable, not easy to damage. Item Type: Leak DetectorMaterial: ABS + MetalWeight: Approx. 380g/13.4ozProduct Size: Approx. 6 x 4 x 2cm/2.4 x 1.6 x 0.8inColor: BlackConsuming Current: 15mAhUse Battery: Lithium Battery 3.7V Batteries (Built-in Battery)Probe Sensitivity: -10D db- -70D dbMaximum Audio Amplification Factor: 20000XPenetrability: Pipe/ Cement Pipe/ Steel PipeAnswering Method: Earphone can be connected with 16 ohm speakerInstructions for use:1. Insert the probe or probe into the audio input jack2. Insert the earphone into the audio output jack3. The red light is on when charging, and the red light is off when completely charged 1 x Host Detector1 x Plug1 x Circular Probe1 x Needle Probe1 x USB Cable1 x Headphone1 x Instruction