Graces Dawn&reg; Mushroom Shaped Ionizer Air Purifier LED Desk Lamp / Rechargeable Energy Saving Book Light with Touch Adjustable Brightness / Health Negative Ion Anti-radiation This mushroom lamp is an air purifier and night light, and also can protect your eyes. Anion Air Cleaning-Purification of airborne bacteria, secondhand smoke, dust,the negative ions generates and also remove particles as small as 0.01 microns, such as polutants, bacteria, fine dusts, smokes & viruses which cannot be removed by filtered air purifier With 48 Led lamp bead, can do meet to read, learning ,working to use Touch sensor switch, Self-adjusting the levels of lightEnvironment friendliness and low energy consumption There are 2 kinds of power supply: Use USB power supply or use the built-in battery power supply. When the built-in battery in the dim light, please charge with the USB cable. Anion Function can be used only in the case of an external power supply.