Description: LED Reading Glasses with Protective Case Case Size: 155MM X 45MM X35MM12 Magnify Strengths: +0.0 ,+1.00,+1.25, +1.50, +1.75,+2.00, +2.25,+2.50 ,+2.75,+3.00,+3.25,+3.50Battery Type: 4 x CR927 button cell batteries, included Feature: These are the reading glasses that have built-in super-bright LEDs in the upper corners of the lens frame, allowing you to work in bed without disturbing your sleeping partner, repair a fuse during a power outage, or read  in the car without inconveniencing the driver. 

Material: Plastic frames & High-Quality Refractive Lenses battery can be replaceable easily for end consumer, if used continuely, LED light lasts approximately 30 hours.