Features: brand new and high quality Output signal type switching: red button function: magnetoelectric signal and Hall signal switching button. Press the button: output the magnetoelectric signal. Release the button: output Hall signal. For some generators, when the red button is pressed, the Hall signal is output, and the button is released to output the magnetoelectric signal. The user can use a multimeter to check the output signal type. Use a multimeter (20V measurement) to test the output of the signal generator, the output is about 5.8V, and the output is a Hall signal. If the output is 0V, the output signal type is a magnetoelectric signal. Regarding the working power input: The working power of the signal generator is 12VDC, and the user can use 12V power to power the car battery, or use any other 12V regulated switching power supply or AC/for DC power adapter. Regarding the signal output GND. If the Hall signal output is used, the signal output GND and the working power supply GND share the same ground. If the 12V working power supply provided by the car battery is used, the user only needs to connect the signal output positive wire. If the magnetoelectric signal output is used, the signal output GND and the working power supply GND do not share the same ground. The user must correctly connect the output signal positive line and the output signal negative GND line, so that the signal generator can work normally. Specifications: Material:Plastic Net Weight:230g Package Includes: 1x Car Signal Generator note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.