STEELMAN 97220 Mini EngineEAR Diagnostic Listening Device Convenient diagnostic tool can pin-point location of noise caused by bad bearings, bushings, dirty fuel injectors, wind and air leaks, noisy valves and lifters Allows user to monitor gears, bearings and suspension components under load so problems can be more accurately diagnosed Plugging in the sensor clamp temporarily de-activates microphone inside of sensing tip, activating sensor clamp pick-up for vibration detection Ultra sensitive microphone provides a full range of sound Kit includes hand set, ear bud style earphones, sensor clamp with 16 foot cable lead, inductive metal probe, storage pouch and 1 AA battery