Multiple Objective Magnifications- Exclusively designed with 2 objective slots and 1 fixed front round objective (8X), the two rear objective slots can be loaded with only one or two objectives at a time from the five (1X, 1.5X, 2X, 2.5X, 3.5X). After combining, 31 magnifications can be obtained.Humanized adjustment - Foldable lens allows free combination - All the lenses of the headlamp can be folded when not needed, you can therefore use any lens or any free combination among the three (1 fixed lens and 2 replaceable lenses on the double slots).Comfortable to wear - Lightly padded headband with two buttons left and right rotatable, turn counterclockwise to release the whole light frame from the headband, so you can freely adjust the whole light frame up or down at the angle that is needed. The tail button is used to adjust the size of the headband to fit different heads, pull it out and rotate it left or right to get your head size, then press it to lock it.As headlight adjustable brightness- 3 bright LEDs with 2 level brightness adjustment. The angle of the light can be adjusted left/right/down, and this part can be disassembled as a portable flashlight.Various Uses- Improve your low vision and free your hands at work at the same time. Many magnifications are available for different uses: reading, painting, observing, modeling, repairing, sewing, soldering, jewelry making and other hobbies/crafts.