Mighty Bright-LED XtraFlex Book Light. Enjoy the bright white, energy-efficient LEDs last 100,000 hours! No replacement necessary. The engineered optical grade lens spreads light evenly. Has a small, stable base and sturdy clip and an adjustable neck that holds the light securely in place. Powered by three AAA batteries. This package contains one 7x 3inch x 3.8cm LED XtraFlex Book Light and three AAA batteries. Comes in a variety of colours. Each sold separately. Imported.