Features:By using pulses and vibration of electric AppliancesRise the original low voltage to high negative pressure. Making Use of high voltage of carbon brush tip to produce high corona, emiting large amounts of electronic at a high speed. Electronics can not remain in the air for a long time, therefore,after reacting with oxygen molecules in the air , negative ions will form.Specification:Material: ABS+Silicone LineColor: show as pictures Size:14cm x 3cm x 3cmConversion: 1cm=0.3937 inch, 1inch=2.54 cmWeight: 13gPackage Included:1x Negative Ion Anion GeneratorNote: 1.Please allow 0.1-0.3cm differences due to manual measurement, thanks.2.Please understand because of the light irradiation or computer display difference, so I can't guarantee photos and real color is 100% the same.