The desk lamp can sense ambient light and automatically adjust the appropriate brightness. Automatically brighten the dim lighting environment to avoid fatigue caused by dim lighting. The bright light environment is automatically dimmed to avoid discomfort caused by too strong light. The lamps memory function retains preset settings and reboots accordingly. Table lamp is controlled by knob switch and key switch. [Power on and off] press the rotary knob button, [Change color mode] Press the button on the right to adjust the color: Natural light - White light - Warm light. [Adjust the brightness] Turn the rotary knob to adjust the brightness. You can adjust the brightness of any color modes. Shines a flicker-free light that brightens your space without harming your eyes; ideal for reading, working or studying. Designed with 1 USB charging port on the lamp base, convenient to charge your mobile phones, tablets, kindles or other electric devices. The USB port can be used whether the lamp is on or off. Anti-slip pad is firmly attached to the surface of the bottom. Durable flexible gooseneck allows you to adjust your desk lamp with ease and to direct the light wherever you want.