DRY mode, COOL mode, and the negative ion lamp all function without issue. The original box and instruction manual are not included. I used it twice but it didn't suit me, so I'm selling it. This item has been stored at home, so please refrain from purchasing if you are concerned about minor scratches or stains. ① Koizumi Hair Dryer The following is quoted: Equipped with a low-temperature scalp function of approximately 60°C. Gently dries hair while caring for the scalp. It's easy to use with a one-push cold air switch, and it also features twin negative ions, which are beneficial for the hair. Power supply: AC100V 50/60Hz Size: Approximately 237(W) x 96(D) x 216(H)mm Weight: Approximately 525g Ions: Twin negative ions Hair entanglement prevention mechanism: Yes Power consumption: 1200W Cool switch: COOL-HOT switching Temperature setting: Scalp switch: ON-OFF Manufacturer: Koizumi Seiki KOIZUMI (Koizumi) Hair dryer, 2023 model High airflow, Koizumi, quick-drying, low temperature Scalp, KHD-9230 Negative ions, cool mode Negative ions, gold KHD9230, KOIZUMI ② Tescom Curling Dryer IONE NATURAM TESCOM TIC290 ⚪︎The switch has two settings: [DRY-COOL-OFF]. ⚪︎The lamp lights up when negative ions are generated.