1.Various Kinds Of Protections,Input Frequency Is Available To Check Rpm 2. Of Sensor Curves' Parameters Is Set Inside 3.Sensor Curve Can Be Self-Defined By Buttons 4.High-Light Digital Tube Can Demonstrate The Parameters 5.English And Symbols Demonstration,The Parameters Can Be Set And Adjusted By The Button On The Front Face. Model: GM50 Power Supply: DC8~36V Power Consumption: Max: 1W Sensor Input Resistance: 0~1000 Speed Input Signal Frequency Range: Freq300Hz~15kHz Speed Input Signal Amplitude Range: AC3~16V Input Generating Frequency: Freq45~70Hz Input Power Generation Voltage AC40~280V Colour:black Material:plastic Size: 10 x 10 x 6.8cm Package Contents: 1 x Generator Controller 1 Set x Screw And Nut Accessories 1 x English Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.