Adopted the advanced technology, it lasts for 37 hours at speed 1, 33 hours at speed 2, 20 hours at speed 3 after about 3-4 hours full charge. With enlarged blades, the wind increased 30% compared to the original version. The maximum rotating speed of the fan is 3400 rpm which is enough for personal use to keep you cool. The folding design makes it easy to be carried and stored. Besides, with the capsule shape(5.1*1.65*1.65 inch, weight: 6.38 OZ), this rechargeable fan can hide the fan blade, small and easy to slide into your pocket and purse. 5V/1A USB output port makes the mini fan a power bank(4500mAh) in emergency, supplying power for mobile phone, MP3, or iPod, etc. With no frame design, makes the noise to 50 db which cause no bothering during work. Long press the power button to open the flashlight feature when fan is not spinning. The flashlight is quite bright and can be useful in dark areas or if electricity is out. And with lanyard included,you can hang it on hands or travel backpack. The touchable blades, surge and short circuit protection, keep you and your family safe.