The key features
Extra wide beam for spread lightingClips to any book for readingDimmable light switchFlexible neck to position beam3 AAA batteries for prolonged use

The blurb

A very useful clip-on reading light, featuring an extra wide light beam ideal for lighting bigger areas including larger format books, plans, and maps. Often used by music performers! Combined with a flexible, positionable neck and longer battery life, this is a very practical multipurpose book light! The Really Serious Book Light Range is a coordinated collection of reading lights designed to suit the needs of all kinds of book light users.