Usage Tips:GM50H is one light and low price-orientated module used for demonstrating engine RPM,water/oil temperature, oil pressure, battery voltage and Hours. The users can adjust and set the parameters by the button on the front face in order to meet the different requests. Besides, it uses the European-style terminals for connection which is more convenient for installation and detachment. Various kinds of protections. Input frequency is available to check RPM Variety of sensor curves' parameters is set inside Sensor curve can be self-defined by buttons High-light digital tube can demonstrate the parameters. English and symbols demonstration Specification: Power:DC8-36V Consumption Power:MAX:1W Sensor Resistance:0-1000Ohm Frequency range of RPM Input signal:Freq 300Hz-15KHz] Amplitude range iof RPM input signal:AC3-65V Input Power signal:AC20-280V(45-70hZ) Input Frequency:Freq45-70Hz Input Voltage:AC40-280V Ingress protection:IP54 Size:100 x 100 x 77mm Installation Size:91 x 91mm color:Black Material:plastic Package Contents: 1 x Engine Multi Function Digital Meter Only the above package content, other products are not included. Note: Light shooting 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.