Best-electric Electric Personal Fan 4 Speeds Desktop Summer Cooler Fan with Timing Setting Function Rechargeable USB Cable (black) 4 adjustable modes: low, medium, high ,super high; Timing function: fan running time can be set, the shortest can be set for 10 minutes, the longest can be set for 120 minutes. Powered by battery or by USB: high capacity lithium battery, charging circuit. LED Power visual design, monitor tehe power usage at any time. Intelligent control, the function is perfect, the operation ifs simple,stable and reliable performance. Unique and fashionable: Intelligent control system, reliable performance, fully functional and easy operation