Feature: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 DetectorProduct Material: AlloyProduct Size: Approx.7.4 x 7.3 x 2.6cm / 2.9 x 2.87 x 1inBattery (Shipped With Built in Battery): Lithium Battery, Capacity 800mahFour Level: A Level (200Hz), B Level (800Hz), C Level (1200Hz), D Level (Probe Tube)Probe Sensitivity: -70dbMaximum Audio Amplification: 20,000 TimesWeight: Approx.683g / 24.1ozHow to Use:Insert the earbuds into the headphone hole, the probe into the MIC hole, rotate the volume switch clockwise, the power indicator lights up, the mediation gear rotating knob ABC three gears, select the best effect. F 999B another FM transmitting function, the antenna into the FM jack after this function is automatically turned on, transmitting frequency: about 100 megabytes.Package List:1 x Host1 x Probe Head1 x Probe1 x Antenna1 x Plug1 x Headphone1 x User Manual1 x Storage Boxor1 x Host1 x Probe Head1 x Probe1 x Antenna1 x USB Plug1 x Headphone1 x User Manual1 x Storage Box