Large capacity battery & 3 colors mode & stepless brightness adjusted: 3000mAH rechargeable battery providing up to 5-6 hours on maximum brightness and 100 hours on the lowest setting, built-in battery provides plenty of hours of use. This light has 3 color modes: yellow(3000K/3500K), warm white(4000K) and cool white(5000K/6500K), Stepless brightness (from 10% to 100%) = unlimited lighting options for any modes as working, reading, sleeping