ETONG Mini 4-inch USB Electric Cooling Fan Rechargeable Portable Table Fan 3-speed Electric Personal Fan with LED (Black) Mini portable fan, simple appearance and firm structure, LED lighting three gear speeds to meet your need. Multiple ways of power supply: connect the fan with USB cable to power bank and computer or any USB outlet , or using a adapt plug to charge the fan battery. 2-8 Hours long working time (Depend on the mode you use). With inner LED Light function (Long Press"on") and side LED function for emergency use. Portable mini fan powered by lithium rechargeable battery, house,office or outdoor,wherever you are, it always offers cool wind. Speed program:speed program is low-medium-high-turn on the side LED light- power off. Please remove the insulating film of the battery before use. And fully charge the battery for 5 hours when first use.