DC motor, designed for energy efficiency, not only operates with less noise but also consumes less power. Maximum height of the whole machine after installation is 21 in. the minimum is 15 in. The ceiling fan light has 2-hanging rod lengths to choose from, which are 4 in. and 10-inch. You can choose the right length of the ceiling pole for installation. Ceiling fan also offers timing function of 1/ 4/8-hour, sleep more comfortable and on ease all the night, timing settings, automatic shutdown. Ventilation function: Press the ventilation button and start to turn at 3-speeds for 15-minutes, then the fan will automatically turn off, and after an hour the fan will automatically turn on again at 3-speeds for 15-minutes, and so on. (Ventilation mode will be canceled if other buttons are pressed after the ventilation mode has been switched on, the original fan is rotating and the ventilation mode is rotating, if the fan is reversed, the ventilation mode is reversed). LED integrated light: they offer the benefits of energy efficiency, long lifespan, and high-quality lighting. Indoor and Outdoor Available You can choose to use this fan light indoors and outdoors, but when you use it outdoors, you need to have a cover to use it. The reversible function provides 2-airflow modes: It runs downdraft cool airflow during summer and updraft airflow during winter to aid in rotating warm air, promoting air circulation and saving energy.