National Model 126 MS cordless microscope. Mechanical stage for precise movement. Objective lenses for 4x, 10x, and 40x magnification. Powered by 3 rechargeable AA batteries. 8-hour charge allows 40-50 hours of use. Recharge batteries up to 1,000 times. LED light source equal to 20W tungsten. Great for portability or for sites without a standard wall power source. The LED light source resists shock and will last throughout the life of the scope.