The S6700E Speed control Unit is an All-Electronic Device Designed to control engine speed with fast and precise response to transient load changes. Based on a closed loop control. The basic characteristics of this unit is to reach rated speed and power as well as reducing smoke exhaust through adjustment of firing fuel and speed-rate. The S6700E speed control Unit provides a series of protection once the power supply is reversely connected. Transient overvoltage or actuator fault happens, or Speed input breaks. Power reverse connection protection Actuator default protection Speed signal Lose protection Over-speed & External high Level input Alam Environmental Ambient operating temperature range - 40 - 85 C Relative humidity 95% Input Power Supply 24VDC Actuator current range 2.5-10A(continuous) Speed sensor signal 1-20v Characteristics Speed fine adjustment range 100% r / min Frequency fluctuation 0.25% Steady speed droop 0-3% (variable) Temperature drift 1% (maximum) Color: Black Material: ABS Package Contents: 1x S6700E speed controller 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.