Features: -this little rechargeable usb personal desk fan is well designed and portable.You can take it anywhere you want -very powerful: the little fan uses high quality motor. Its max wind speed is up to 4.2m/s on the highest speed. Moves a big vortex of air; perfect for personal cooling -3 adjustable speeds: you can cool yourself down with high, medium or low mode at your will. A single rock switch makes the operation like a breeze. -dual powered: powered by a replaceable and rechargeable 2200mah high quality 18650 battery ( included );2.5~6 hours working time depend on different speed; or by usb cable, which compatible with computers, power banks, usb chargers, or other other usb-enabled devices. -- work in the dark: come with a bright white led light on one side of the usb fan for illumination use Specification: Speed mode: 3 speed setting(low/medium/high) Output power(max):5w Input voltage:5v Charging time:about 4 hours Battery working time (h): 2(high) 4(medium) 6(low) Battery type: 18650 lithium (2200mah) Charging methods: dc 5v usb & 18650 rechargeable battery Battery installation: removable Dimension(mm): 140*90*40mm N.W.(lb)(including battery): about 0.4 Suit for: Indoor and outdoor using, such as bed, computer, table, desk, sofa, car traveling, fishing, camping, hiking, mountaineering, backpacking, bbq, baby stroller, picnic, biking, boating Operating instruction: 1.Button off: power off immediately 2.Button on: power on, press once to change a speed. The speed program is low-medium-high. Press twice to turn on the side led light, which could work when it is airing. Again, press twice, and the light power off. 3. Charging indicator light: red means charging; green means fully charged. 4. Charging battery through the micro usb input 5. Charging other devices through the usb output 6. When no.5 light is on, then you could charge your phone. Airing and power bank functions could not be used at the same time.