[interchangeable lens] includes 4 pairs of lenses with different magnifications (10x, 15X, 20x, 25x).You can choose the lens according to the size of the object to be observed [2 LED lights] Magnifying glass with LED light, can help work in low light conditions.Battery: 6 LR1130 button batteries (not included) [humanized design] If you use this magnifying glass for a long time, two mirror cylinders can be used alternately to relieve visual fatigue and improve work efficiency [humanized design] If you use this magnifying glass for a long time, two mirror cylinders can be used alternately to relieve visual fatigue and improve work efficiency [Multiple uses] Head-mounted magnifying glasses are suitable for closely observing changes in the details of objects.Suitable for reading newspapers, beauty makeup, jewelry identification, watch repair, etc. [easy to use] LED lamp head is designed separately from the battery compartment of the control switch, can prevent the lighting point of the switch working time source from changing, no need to recalibrate thelighting point when reusing