This is the black model of the HOOH AIR COOLING SYSTEM, which provides cooling via USB connection. - Model Name: HOOH AIR COOLING SYSTEM - Color: Black - Function: Cooling - Power: USB connection I never used this after purchasing it. It costs around 20,000 yen for the full set. I'm selling it because I don't think I'll use it anymore. There are some minor scratches on the battery, but since it has never been used, please rest assured. A separately sold cigarette lighter-type charger is also included. Perfect for summer heat対策. Thank you for looking.