You can adjust the brightness with the built-in dimmer,just put your finger on the switch over 3 seconds ,brightness get low You can also tap the switch , and in the meantime, the light color change warm, white or natural. The cordless table lamps come with half powered,when you get them please charge at least 3 hours,then they can lighting up to 8 hours. The lamp with crystal decor design that looks elegant on a table or nightstand, create a modern look in your entire room. USB charging,cordless table lamp can be take to anywhere you want.Such a lovely lamp to decor your coffee table,dining table,side table or outside patio.