About this item With the light off, press and hold the power button to switch on the nightlight/clock function. Clock setting: press the "H" button on the left side of the clock long press the clock to skip automatically and short press to confirm. Minute setting: press the "M" button on the right-hand side of the clock, then press and hold the minute button to jump automatically, and press briefly to confirm. The battery-powered desk lamp can easily be powered by any available USB port (e.g. laptop computer power bank). Note that the lamp has no charging port for external devices press the button to turn the bulb on (on and off) long press to adjust bulb brightness. The best reading lamps are compatible with pen holders nightlights and clocks. Easy to use, especially for students. It's a good aid for learning to read and the best gift. Bright desk lamp is bright enough to read study work relax sew and more. LED desk lamp with USB charging port 3 lighting modes progressive dimming with touch control bedside reading lamps don't need recharging very often. Built-in 3600 mAh lithium battery can run continuously for 100 hours in eye protection mode after a full charge. The best reading lamps have no flickering light no glare and won't tire your eyes even with long-term use whether working study or reading.