High Quality Interchangeable Lenses YOCTOSUN Magnifying Glasses comes with 4 detachable lenses, which are made of acrylic resin, the surface hardness of the lenses reaches 5H grade, more wear-resistant, high definition, durable and not easy to deteriorate after long-term storage. Meet your different needs for close works. Focal length: 333mm/13.11inch 1.5X , 200mm/7.87inch 2.5X , 142mm/5.59inch 3.5X , 100mm/3.93inch (5X). Three LED Lights with Adjustable Brightness Levels There are two brightness levels which provide excellent light for illuminating detailed surfaces. Two levels of brightness is available by pressing the switch on the eyeglasses bracket. Press the switch the first time to turn on low light, press again to switch to high light, press the third time to turn off the lights.