-Handy : It frees you up a bit with a built-in rechargeable battery, so you can use it up to 1.5hr (Up to : 2step 1.5hr / 1step 4.5hr) without a cable-Olly Day : For daytime use for your better wakeup & sleep tight for the night with 6500K color temperature-Olly Night : Eliminates 480nm wavelength of light (as known as Bluelight) for not interfering with your melatonin se ...View more