Feature 1Double Sided Induction Head: The detector has double sided induction head, which has stronger sensing sensitivity. The sound quality of the 2 sides is different, you need to determine which side is clearer according to the environment. 2REC3.5 Jack: The REC3.5 jack can be connected to an external overlay device, and can be connected to display spectrum, recorder, transmitter, wireless equipment, etc., and can also be inserted into a 2 channel wire for direct recording. 3Purpose: The water leakage detector can penetrate walls to find fluctuating sounds, and can be used to detect fire pipes, home pipes, heating pipes, floor heating pipes, water pipes, and abnormal noises in vehicles. 4Metal Shell: The water leakage monitor adopts metal shell, which has sturdy structure and is not easy to be damaged, and can be used for a long time. 5Adjustable Volume: The volume of the water pipe leak detector can be adjusted through the knob. You can choose the appropriate sound size to make you hear more clearly.Item Type: WaterleakagedetectorMaterial: Zinc alloyWeight: Approx. 1182g/41.7ozProduct Size: 5.3x8.6x2.3cm/2.1x3.4x0.9inBattery: Nickel hydrogen battery, model 6F22, 9V, capacity 800mAh(Shipped with built in battery)Measuring Objects: Fire fighting pipes, household pipes, heating pipes, floor heating pipes, water pipes, and abnormal noise of road vehiclesDescription of Function Expansion: (REC) The 3.5 jack can be externally connected with the functions of superimposing equipment, such as connecting the display spectrum, recording pen, transmitter, wireless equipment, etc., and can also be inserted into the dual channel lead for direct recording. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Host1 x Induction Head1 x Headset1 x Aluminum Box1 x InstructionsNoteTurn the power supply and volume, and the sound field strength will change with the volume.