Features: 1.Abnormal Sound Detector: High?performance diagnostic tools especially for noise that can easily identify automotive early problems and facilitate car repair as soon as possible. 2.Multi Channel: When a generator is running, it can detect the impact of vibration due the failure of a bearing, gear, valve, crank, cylinder, gear case, vehicle body noise, etc. 3.Quick Detection: Car noise stethoscope can rapidly detect crude oil / gasoline engine cylinder mechanical noises emitted and accurately identify the fault location. 4.Ergonomic Design: Machine noise detector is easy and fast for user to use with simple key operation mode and comfortable hand feeling. Suitable for automotive chassis transmission operating conditions for monitoring. 5.Easy Operation: Six?channel design acousto?optic synchronization, simple and comfortable earphones and the volume can be adjusted at will, you can select the channel you want to receive and send the sound to the headset. Specification: Item Type: Electronic Stethoscope_x000D_ Color: Black_x000D_ Frequency Range: 100Hz-10kHz_x000D_ Input Impedance: Greater than 15M ohm_x000D_ Allowable Environmental Noise: 100dB_x000D_ Battery Type: 4pcs AAA batteries (excluded)_x000D_ Working Temperature: -10-55