Material: ABS + electronic components Power supply mode: USB charging Lithium battery: 1800mah Rated voltage: 5V Rated power: 3.5W Gear position: 5 speeds Function: 5 adjustable speeds, intelligent battery display, ambient lighting Packaging method: boxed Size: 19*18.5cm Package size: 23 x 19.7 x 6.4 cm. Package weight: 300g Package accessories: 1 x hanging neck fan, 1 x USB cable. Feature: 1. Low noise: portable with brushless motor and high-quality noise-reducing materials, 200% active noise reduction, sound as low as 20 decibels (does not affect your study or concentration at work). 2. Easy to carry: The neck width of our personal fan can be adjusted within the range of 10-30 cm, suitable for different neck sizes, including women, men and even children. Lightweight, easy to carry outdoors and indoors, suitable for many activities and places, such as travel, camping, running, kitchen, beach, office, gym, etc. 3. Five wind speed selections: Our portable fan has five speed settings to meet your different needs and won't make you feel hot in the summer. 4. Long battery life & Smart display: Rechargeable portable fan, built-in 1800mAh high-capacity battery, charged with USB data cable. Charging for 4-5 hours can be used for up to 4-8 hours. The smart display shows the current battery capacity and wind speed gear, which is convenient for charging and adjusting the appropriate wind speed when needed.