acrosser Working voltage: first 7.5V, second 6.5V, third 5.5VUse (maximum): 6W capacity: 3000 mAhNegative ion working : 1WNegative ion concentration: 1000W (test at 100mm)Ozone concentration: less than 0.03PPMCharging : about 3 hoursUse : about 12 hours for the first , about 7 hours for the second , and 4 hours for the third .Colour: black + redMaterial: ABS+PC+electronic componentsSize: 16.2cmx8cmx1.7cmPackage Contents:1 * Fan1 * Lanyard1 * Data cableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.