Usage Tips:and High Quality Small volume, light weight, good mobility This clip-on light has two CR2032 button electronic as power supply, 1 high brightness LED as , Long service life , bright light beam, fashion design Can clamp the edge of any style of glasses legs It can rotate 360 degrees. It is a great helper for your , can be used as a normal glasses. Great to be use in car,in bed,on a airplane,camping or where light are too dark to reading. Flexible Book Reading Lights Night Light For Eyeglass and Tools Universal Portable Mini LED Eyeglass Clip On Book Tips: The product may be updated constantly, The Actual Product May Have Slight Differences Or Color Differences the color and appearance may be changed, please don't mind. And take a consideration before place the order if you have request for color or appearance. Colour:Black Material:plastic Package Contents: 2 x Clip-on Reader Light Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.