Information The full speed simulator is based on the execution instructions sent by the machine CPU to control the PWM signal to adjust the fan speed high or low. General noise reduction equipment such as: silencer speed is fixed. Machine daytime temperature is high, the night temperature is low, the CPU will keep generating PWM signals, if you use the fixed speed simulator, can only simulate a fixed speed, the feedback to the CPU signal will cause a conflict, will affect the machine arithmetic.   Note: This product does not include free shipping and does not support separate orders. You can choose to place an order together with other mining machine products.