... , freatly improved efficiency, longger motor life and competitive price 1. Supply Voltage: 12~75VDC2. Max power: 200W3. Speed control: 100% ... alarmetc5. Can be customized according to customer demands, such as Supply voltage range, No noise, hall-free, power,etc.6. ... speed controls, fan good/bad alarm,temperature/pressure/CO2 sensor alarm and custom fan trays. our driver and controller are widely used ...