Manual and Automatic 2-in-1 Mode Fan: [MANUAL MODE] - Set the rocker switch to “MAN”, allowing the fan to continuously run. Set the rocker switch to “O”, the fan will turn off. [AUTO MODE] - This whf100 heater fan has a built-in thermostat, if you set the rocker switch to “AUTO”, which will turn the fan on and off based on ambient room temperature.
eBay