instructions: 1. Power on/off: Long press and hold for 1.5 seconds power button to turn on/off; The default air volume when turned on is 1, and it starts working; 2. Gear adjustment: Long press and hold the+key, hold down and upshift from 1 to 199; Long press the - key and hold it down to downshift up to 199 to 1; 3. Double click power button to turn on or off the cooling function cooling temperature 10-15 degrees; 4. When charging, the number on the display screen increases from 1 to 100, indicating that it is fully charged; 5. Gear: 199 gears, short press to switch 1 gear, long press to switch 10 gears 6. Wired mode: Dual use for charging and plugging, bidding farewell to battery anxiety issues; Plug and play long-lasting battery life Noted: Due to manual measurement, the length may deviate by 1-2cm. Please understand. Due to the fact that the image was uploaded after shooting, it is normal for the display screen to show a slight color difference from the actual object.