Features: 1. Suitable for all kinds of masque: It can be easily attach to your mask. Clip it to any type of mask, such as sewn or fabric masque, and more. 2. Low Noise Operation: Designed to bring you cool air movement whenever you need it to keep you fresh. It adopts nano-silver coated filter and 3 ultra-quiet fan speed, working noise 25dB. 3. Easy Charging: Powered by USB rechargeable high-capacity battery. About 4 hours of uninterrupted cooling on a single charge. Compatible with a variety of charging methods: power banks, adapter, computer. Make sure you have fresh air wherever you go. 4. Portable and Lightweight: you can barely feel you are wearing it. The perfect fan for the pocket size mask when working, traveling or even running outdoors. 5. If you have any question, please feel free to contact us. Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Description: Material: ABS + electronic components Size: 16 x 28 x 64 mm Input current/voltage: DC5V/85mA Net weight: 21g