1. Frequency of replacement: The filter should be replaced every 2-3 months to keep the cooling unit clean and blown 2. Easy to install. Fills in seconds. The surrounding air will gradually disappear in a short period of time. 3. The filter is made of nanotechnology. Absorbs water and does not contain any toxic chemicals. 4. Suitable for mini portable USB air purifier, can absorb quickly and effectively. 5. It can eliminate odor and keep the air cooler clean. 6. Material: ABS+paper/non-woven 7. Size: about 12 x 11 x 12cm
