This ingenious fan brings you the best breeze you could ever ask for while being dead silent constantly. It provides three-speed wind adjustment and a silent motor. With a built-in 6000MAH lithium battery it can be used as a mobile phone charger as well. It’s equipped with a hanging lanyard, so you can also hang it around your neck. Its lightweight design won’t give you neck fatigue, & the vertical airflow blows cool air up toward your face. Once fully charged, the maximum working hours are up to 22 hours at low speed, 15 hours at middle speed, and 8 hours at high speed.