4 Lights Match Your Purpose with 5 custom levels of brightness for work, study, reading, or relaxing. Convenient USB Charging: Recharge your devices via the built-in 5V/1A USB output; keep your smartphone or tablet within reach while charging. Rotate the lamp arm up to 140° or swivel the base by 180° for a more direct illumination. 1 Hour Auto-Off Timer to save on your electricity bill if you fall asleep under the lamp.