Special instrument for searching and confirming the location of water pipe leak. Highly sensitive, slowly adjust volume so as not to discomfort your ears. With dual probes, including circular probe and needle probe to cope with different situations. Small size, premium quality, convenient to use. Specifications: Material: ABS + Metal Color: Black Input: AC 100-240V 50/60Hz 150mA Output: DC 5V 1000mA Working Current: 10mA Maximum Audio Amplification Factor: 20,000X Built-in Battery: 3.7V 300mAh Lithium Battery Item Size: 6 * 4 * 2cm / 2.4 * 1.6 * 0.8in Item Weight: 208g / 7.3oz Package Size: 21 * 15 * 4cm / 8.3 * 5.9 * 1.6in Package Weight: 379g / 13.4oz Package List: 1 * Host 1 * Adaptor 1 * Circular Probe 1 * Needle Probe 1 * USB Cable 1 * Earphone 1 * Manual Special instrument for searching and confirming the location of water pipe leak. Detect pipe leakage by amplifying the sound with headphones, you can adjust the sound level. With dual probes, including circular probe and needle probe to cope with different situations. Made of high-quality ABS and metal, wear-resistant and durable, not easy to damage. Small size, built-in rechargeable lithium battery, convenient to carry and measure.