TWO HEADS ARE BETTER THAN ONE! The Mighty Bright XtraFlex Duet features two XtraFlex arms with independent heads with super LEDs, each 3-times brighter than a regular LED. You can use one light or two and because each head has a lense over the LED, the light spreads evenly with no hot spots. The arms are easily bent to point the light into any position and when done can be coiled up for compact storage. There are no bulbs to ever replace and because it's and LED there is an extra long battery life. It uses 3 AAA batteries which are included.