Each lampshade is unique since it is made of bamboo with natural color variations and is hand-woven by skilled craftspeople. If you want to dim the light, just turn the knob. By dimming the lighting, you change the mood in the room while saving energy. You can easily connect the portable lamp to a power source and charge the batteries by using the included USB cable. The material brings a piece of nature into your home and spreads a calm, warm feeling. Dimmable. Built-in LED light source. The light source has a lifetime of approx. 25,000 hours. This corresponds to about 20 years if the lamp is on for 3 hours per day. When the battery is fully charged, the lights will shine for approx. 12 hours. Batteries are sold separately. IKEA recommends LADDA rechargeable battery 2450 mAh HR6 AA 1.2V. 4 pieces required. Each product is a unique, handmade work of art with natural variations in color and shape. USB cord is included. Product Size Height: 11 " Cord length: 3 ' 3 " Luminous flux: 55 Lumen Diameter: 9 " Power: 5.0 W Estimated life: 25000 hr Materials Shade: Bamboo, Clear acrylic lacquer Shade holder/ Housing/ Switch cover: Steel, Powder coating Diffuser/ Base/ Cover: Polycarbonate plastic Protection pad: EVA plastic