Description: 1.Output Signal Type Switching: RED Button Function.User can use multimeter to check output signal type 2.About Operating power supplily Input: The operating power supplily of that signal generators is 12VDC, user can use the 12V power supplily for the Battery of the car, or user any other 12V regulated switching  3.9 ranges of frequency selection, accurate frequency output. 4.Magnetoelectric signal or Hall signal output. Output amplitude/ volts equal to power supplily input, can be adjusted by adding potentiometer.     Specification: Colour: Random (Black / blue color) Material: ABS + electronic components Size Chart: size:As shown in the picture Package Includes: 1 piece auto vehicle signal generators(Random Color) 1 x Testing Clip(other accessories demo in the picture is not included.) Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!