Product descriptions Product material: ABS Product size: 122mm*108mm*142mm 5V - 1A input: 18650 model lithium battery Power consumption: 4 W, battery capacity 2400 mAh Rated voltage: 220-240V Lifetime: 1st gear 11H / 2nd gear 6/3. Gear 5H Product standard configuration: one product, one data cable, one instruction manual 1. [3 in 1 Design] - This is a multifunctional device. In summer, it lowers the temperature. In winter, it works as a humidifier and air purifier to avoid dry air, reduce dust and smoke 2. [Less noise] - Our USB air conditioner has three wind speeds. The higher the speed, the better the cooling effect. According to our test, level 1 speed is absolutely bearable at night. We therefore recommend that you choose level 1 when you sleep 3. [Cordless Operation, Longer Working Hours - Our mini air conditioner has a built-in battery, so you can continue to use it if there is no power outlet. Charging time is approximately 3 hours. When fully charged, level 1 speed: working hour is about 8 hours; Level 2: working hours are approximately 4.5 hours; level 3: working time is about 2.5 hours 4. [Portable, Can Be Taken Anywhere] - Our cooling fan size is portable, good to take to office and camping. It's also great as a desk fan because it doesn't take up too much space.