The SmarTemp 3.0, No. 5013873A, and SmarTemp 3.0 Bluetooth, No. 5013874A, controllers from Webasto provide ease of use and control of both Webasto fuel-operated air heaters and fuel-operated coolant heaters, all from a single unit. The rotary dials of the controllers allow air heater users to dial in the temperature they desire, and the device does the rest. The unit’s large backlit LCD screen is easy to read and brightens while in use, automatically dimming itself a few moments after interaction. Integrated panels softly glow red when in heating mode, blue when in ventilation mode, and blink to indicate diagnostic alerts and heater fault codes.