Autos Noise Finder Detector Electronic Stethoscope with An Adjustable Headset Small size and Light weight It can quickly monitor the noise for the machine Detecting noise in engine, bearings, motors, chassis, transmissions and other parts.Suitable for autos, ships, aircraft, machine tools and other mechanical equipment. Frequency Range : 100Hz~10KHz, Working Temperature : -10C ~ 55C, Ambient Noise Permitted : 100dB LED light indicate the strength of signal of the active channel