Features： 1、Material: Full metal body, fine workmanship, accurate high end professional instruments and equipment. 2、High Performance: Superior performance, clear sound quality, strong sensitivity, imported components. 3、Four Level Adjustment: A Level (200Hz), B Level (800Hz), C Level (1200Hz), D Level (Probe Tube), to meet the use of different conditions. 4、Accessories: Built in FM wireless transmitting components, able to transmit the signal wirelessly to a distance. Equipped with expansion jacks, able to connect external devices for additional functions. 5、Measurement Objects: Fire pipes, household pipes, heating pipes, floor heating pipes, water pipes, road car noise. Specification： Item Type: Pipe Leakage Detector Product Material: Alloy Product Size: Approx.7.4 x 7.3 x 2.6cm / 2.9 x 2.87 x 1in Battery (Shipped With Built in Battery): Lithium Battery, Capacity 800mah Four Level: A Level (200Hz), B Level (800Hz), C Level (1200Hz), D Level (Probe Tube) Probe Sensitivity: -70db Maximum Audio Amplification: 20,000 Times Weight: Approx.683g / 24.1oz Package List： 1 x Host 1 x Probe Head 1 x Probe 1 x Antenna 1 x USB Plug 1 x Headphone 1 x User Manual 1 x Storage Box