Description: Features: brand new and high quality Designed for comfortable for protection against, pollen, fumes, common air irritants, and other non-oil based particles. Comfortable fit: elastic and adjustable strap with magic sticker design, one size suitable for most women and men. Single outlet valve: exhaust gas and refuse secondary pollution. Silent and ultra-thin fan, USB rechargeable. The silica gel fits perfectly. According to for facial engineering design, fit the face without stimulation. Round corners, comfortable fit. Built with internal turbo fan and 2 speed levels can be adjusted, keep the for fresh air flowing through your nose and mouth. The filter chip for this product is consumable and needs to be replaced regularly. Can be used for 7-15 days. The 4-layer filter net is highly efficient in purifying the air, corresponding to different sizes respectively polluant, can lock the air particle size less than harmful particulate matter of PM2.5. Notice: Please be kindly noted,the listed product is produced and distributed abroad and subject to the laws of its country of origin. Specification: Material: ABS Voltage: 5V Charging Time: 2-3 hours Working Time: 4-6 hours Power Supply: USB Charging Filter Size: app. 66x55mm(2.60x2.17in) Mouth Mask Size: app. 106x92x68mm(4.17x3.62x2.68in) Optional Color: A 5Pcs x Filter Chip, BK 1 x Black Mask, for W 1 x White Mask Quantity: 1 pc/1 set Note: Transition: 1cm=10mm=0.39inch With retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: Color A: 5 pcs x Filter Chip Color BK/W: 1 x Electric Mask (other accessories demo in the picture is not included.)