Lun
The term "ion" on your fan refers to the ionizer feature. This feature releases negative ions into the air, which can help improve air quality by reducing allergens, pollutants, and odors.
A human Feature in Geography is something that humans have created or built, such as a housing estate or park.
feature
A border that follows a river or mountain range or similar natural feature.
Bucket seats are an optional feature on this model.
IP Security
The speaker bar is optional.
No the Move Controller is a PS3 Playstation optional feature
Reference. Apex Uses of Business Letters
It means the comments you put are optional, you don't have to comment
recommended but optional
promotion code optional for credit card
Something that can be chosen but is not required. For instance, you can have a hamburger, but do not need to have pickles on it, they would be optional.
Optional means not required(you don't have to) but you could if you wanted to.
It's an optional feature. It also has Dual-band Wi-Fi.
Unfortunately, a voice modem is not standard on this model.