O2 Curve 靜電過濾層，可以阻隔 0.1 微米 (百萬分之一米)大的物質。
O2 Filter 未必設有盒裝，購買前敬請留意！
The O2 Curve Electrostatic Filters (formerly known as O2 Commuter Filters) are charged with pockets of both negative and positive ions. They attract, trap and neutralize small particles. The O2 Curve filters are capable of blocking particles as small as 0.1 microns. They trap mechanical pollutants found in pollution as well as bacteria and diseases, and based on average use the filter can last up to 2 weeks.
Note: The filter goes inside your mask and needs to be changed at regular intervals depending on usage.