Elegoo Mini Air Purifier With Activated Carbon Filter And Universal, Pack Of 2 Product Details Odor Control: Activated carbon can absorb and filter the irritant resin odor before they are ventilated throughout the cooling fan at a super adsorption rate, which gives you fresh and safe user experience. Replaceable Carbon Filter: It comes with one activated carbon block which can be used for 3 to 6 months. The carbon can be replaced and need to be purchased separately. Long Endurance?With the 2000mAh battery, it can work continuously for at least 24H once fully charged via the power adapter included. Wide application?Not only for ELEGOO Mars Printer, it also can be used for LCD, DLP, MSLA Resin 3D Printer Well-Protected Package: Well-designed and sturdy box stuffed with all the parts, keeping it from damage during transportation. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.