Battery Operated & USB Powered: GAITIR rechargeable desk fan is equipped with a built-in 7800mAh battery that delivers up to 12 hours of cool air on a full charge ideal for your office desk, bedside, RV, tent, or patio. It can also be used via Type-C USB port from your PC, laptop, power bank or USB charger for comfort in home office or bedroom. You can get true grab-and-go cooling that fits your day, not the cord length.