1. Output Signal Type Switching: RED Button Function: Magnetoelectric signal and Hall signal switching button. Press down the button: it outputs magnetoelectic signal. Release the button: it outputs Hall signal. For some generators, when press down the red button, it outputs Hall signal, release button, outputs magnetoelectric signal. 2. can use multimeter to check output signal type. Use multimeter (20V measurement) to test the signal generator output, it output is about 5.8V, output is Hall signal, if output is 0V, the output signal type is Magnetoelectric signal. 3. About Operating Power Supply Input: The operating power supply of that signal generator is 12VDC, can use the 12V power supply for the Battery of the car, or any other 12V regulated switching power supply or AC/DC power adapter. 4. About Signal Output GND. If use Hall signal output, signal output GND and the operating power supply GND are in common ground, if use the 12V operating power supply from the battery of the car, only needs to connect Signal output wire. 5. If use magnetoelectric signal output, signal output GND and the operating power supply GND are NOT in common ground, must correctly connect both the output signal wire and output signal negative GND wire, thus the signal generator can operate normally. Crankshaft position sensor signal simulation output: including 9 types of gear missing teeth signal: 58+2, 58+1, 57+2, 57+1, 37+1, 36+2, 35+1, 34+2, 22+1. One type of standard 60+0 signal simulation output. Magnetoelectric signal or Hall signal output. Output amplitude/peake volt equals to power supply input, can be adjusted by adding potentiometer. Use 60+0 signal to vehicle speed sensor signal output. Use 60+0 signal to drive odometer or test odometer. ABS sensor, optical sensor signal simulation. Output Parameters All types of signal have been embedded inside the signal generator, and can be displayed in LED screen for reference, no need to download software. One button switch between magnetoelectric signal and Hall signal, convenient to use. 9 ranges of frequency , frequency output. 01 refers to 2Hz-1KHz frequency range. 02 refers to 2Hz-2KHz frequency range. 03 refers to 2Hz-3KHz frequency range. 04 refers to 2Hz-4KHz frequency range. 05 refers to 2Hz-5KHz frequency range. 06 refers to 2Hz-6KHz frequency range. 07 refers to 2Hz-7KHz frequency range. 08 refers to 2Hz-8KHz frequency range. 09 refers to 2Hz-100Hz frequency range. colour:Black Material:ABS+electronic components Package Contents: 1 x auto vehicle signal generator 1 x Testing Clip 1 x English manual Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.