Diameter of lens : 16mm LED powered by six LR1130 batteries (Included) Focal distance : 0.5mm--1cmplease ensure you can accept this before you order this.
Notice : It is a useful and portable observing tool， but generally， if you wanna observe some objects， you can't use your right and left eyes to watch at the same time， just only one eye and also you'd better take turns to see and be near from the things that you want to look.
Package Includes :
1 x 8 Lens 10x 15x 20x 25x Headband 2 LED Magnifier
