Steelman 97170 EngineEAR Elite Electronic stethoscope amplifies sound during diagnosis or verification of proper engine operation Features detachable flex wand with illuminated LED tip to access hard-to-reach spaces Vibration detection mode helps to pinpoint faulty bearings, injectors, squeaks, rattles, and more Noise cancellation feature helps to eliminate background noise Ergonomic handle features rotary volume control and mode selection switch with LED indicator