Features Soft starting of fan motor, protect battery source. Directly control fan speed.Automatically control fan speed.High temperature duration (set able) & alarm signal out put. In case temperature sensor out of order, auto mode switch to manual mode automatically, and alarm signal output. Temperature monitor range available designated by customer.Power wire use 12 AWG.Provide precise power source stabilizer protect precise computer components.Extension alarm indicator outside engine room. Auto and manual mode.