Our SGS-1500 LED Battery Light is an all-in-one light. The lithium Ion battery is built into the light which makes it extremely convenient and long lasting at 11hrs run time at full light output and over 100hrs on low setting. Charging time will vary depending on usage with a max of 10 hours from completely drained (with 5V/2A power supply provided). The dial dimmer allows you to control the brightness and intensity of the SGS-1500 LED Battery Light. It has 3 color temperature settings; warm white, natural white and pure white. When the battery light is low, you can charge it using a 5V/2A USB port for charging your electronic devices.