‎1.1 inches

【3 Light Modes and 6 Adjustable Brightness】The reading light for books in bed there are 3 temperature light Mode Adjustable, yellow(3000K), warm white(4000K) and cool white(6000K). Each head owns an independent switch for 3 brightness levels dimmable. You can choose a comfortable setting as you wish for reading, knitting, camping, repairing, night running etc.
【Hands Free, Eye Caring & Ergonomic Design】With the book lamp , no more holding a flashlight by your hands or mouth, just wear the light around your neck when you read or mend, helps to focus on what you’re doing without worrying about the light. Designed with advanced LED beads ,no eye strain any more for both kids and adults. Narrow beam angle(90°) design make you not disturb your sound asleep partner
【Flexible Arms & Portable Pocket Reading Light】The book light for reading in bed covered with premium comfortable Flexible Arms. Steel alloy arms are flexible simple to create the perfect illumination for yourself angle in different environments. Light weight can easily fit your carry-on suitcase or pocket , it is an ideal choice for all aspects.