Opened, new condition. Easy to attach to your favorite backpack! Keeps your back cool and comfortable! Two fans installed in the backpack pad send air directly to the back, which tends to get sweaty with a backpack! The breathable mesh material prevents unpleasant stuffiness, providing a comfortable backpack life even in summer! The fan part is completely removable from the mesh part, so it can be easily cleaned if it gets dirty! - 3-stage wind power adjustment ● Contents: 410 x 260 x 35mm, 330g ● Gift box (250 x 70 x 140mm) 450g AC adapter (sold separately) ● Materials: Polyester, PP, ABS, PC, Zinc alloy, Nylon