Air cooler: injecting normal temperature water can reduce the temperature by 3-5℃, and injecting cold water can reduce the temperature by 5-7℃. USB table fan: works as a humidifier to moisten the air; reduce , dust and smoke. Miniature air cooler: made of plastic material, it is durable and long-lasting use. so you can be safe to use it. USB cooling fan: the built-in LED light can be used as a night light, which is convenient for night use. Cooling fan: one button releases , allowing you to enjoy cleaner and fresher air.