1、Using this product can perfectly replace expensive imported products. 2、The speed controller can cooperate with a variety of engines. 3、With imported spare parts production, the product is reliable and of good quality. 4、The already improved circuit is featured with higher stability and better performance. 5、100% factory thermoelectric aging experiment can give quality assurance. 1 x Speed Controller 1 x User Manual Item Type: ESD5221 speed controllerSpeed Stability: Better than ± 0.25%Speed Range: 1KHz ~ 7.5KHzThermal Stability: Maximum ±1%IDLE Adjustment: 160±20Hz ~ 95% of rated speedDROOP Adjustment: Minimum position: 15Hz±6Hz / load current change per ampere Maximum Position 400Hz±75Hz / load current change per ampereExternal Speed Adjustment: ±200Hz (external 1KΩ)AUX Input Sensitivity: 148Hz / 1V., ±10Hz., Impedance: 1MΩSTART FUEL Adjustment: 160±20Hz ~ 70% of rated speedRAMP Time Adjustment: 1.5 ~ 20Sec.10V Output Current: Maximum 20mASurroundings:Operating Temperature Range: -40℃~ 85℃Operating Humidity Range: Maxism 95%Storage Temperature: -55℃~ 90℃Vibration: 20-100HZ 500mm/Sec.Input Power:Power Supply Voltage: 12V and 24V DC battery systemGrounding polarity: NegativePower Consumption: 50mAActuator Continuous Current: Minimum 2.5A; maximum 10ASpeed Sensor Signal: 0.5 ~ 120 RMSSize: Approx.  15.2 x 16.5cm / 6 x 6.5in