Hands-free design: Just hang the fan around your neck and enjoy the cool breeze (adjustable safety leash included). It will not swing back and forth and not lead to neck pain when walking. 2000mAh rechargeable battery: it can be used from all 5V USB devices (e.g. power banks, computers, etc.). Once the battery is fully charged, it can be used for 3-15 hours. 3 adjustable speeds: low/medium/high speed settings meet your different wind speed requirements. The highest wind speed blows air at 5.9 m/s. 90-degree rotation: the necklace fan can be adjusted 90 degrees up or down depending on the size or position. Compact and portable: Just put it in a bag and take it with you. Use it anytime and anywhere. An excellent choice for outdoor activities and travel Product Description Color Name:Green,2000 Mah Stay cool anywhere on hot summer days. Perfect, to go to the amusement park / outdoor sports / outdoor concerts / campus walks / hanging out / traveling / hiking / backpacking / picnicking Convenient to take outside by simply hanging from your neck Only 122g , lighter than a phone. Wearing it won't hurt your neck. Specially designed for traveling. Remains still when you hang it around your neck. Doesn't sway back and forth when you walk. Product Description - Hands-free cooling with vertical powerful airflow - Compact and portable - Lightweight design with adjustable safety catch - With a USB charging cable can The fan can be powered and charged by any 5V USB output devices (such as power banks, computers, etc.). - Battery life: 2-7 hours