This air fresher creats up to 5,000,000pcs / cm negative lons Helps to eliminate PM2.5 air pollutants, smoke, odors, dust,etc. Silent operation and easy to use No extra filter needed If you want to have a better immune system in the flu season, stop allergies from bothering you, boost your metabolism, this portable device is a reasonable option. Product Specification: Working voltage: DC5V Power: Less than 0.5w Charging time: 1 hours Working time: 10 hours size:79.5x50.5x21.2mm Material:ABS colour:Black Package Contents: 1 * purifier 1 * usb cable 1 * lanyard 1 * Car clip holder 1 * English manual Only the above package content, other products are not included. Note: Light reflection 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.