1.Various Kinds Of Protections,Input Frequency Is Available To Check Rpm2. Of Sensor Curves' Parameters Is Set Inside3.Sensor Curve Can Be Self-Defined By Buttons4.High-Light Digital Tube Can Demonstrate The Parameters5.English And Symbols Demonstration,The Parameters Can Be Set And Adjusted By The Button On The Front Face.Model: GM50Power Supply: DC8~36VPower Consumption: Max: 1WSensor Input Resistance: 0~1000Speed Input Signal Frequency Range: Freq300Hz~15kHzSpeed Input Signal Amplitude Range: AC3~16VInput Generating Frequency: Freq45~70HzInput Power Generation Voltage AC40~280VColour:blackMaterial:plasticSize: 10 x 10 x 6.8cmPackage Contents:1 x Generator Controller1 Set x Screw And Nut Accessories1 x English ManualOnly 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.