Lumagny 50x LED Illuminated 4" Pen Sized Pocket Microscope Push button LED illlumination - 3 LR726 button batteries included Weighs 0.590 oz - easy to carry with you in your purse or bag without noticing any weight Only 4" long - diameter of viewing lens is 3/8" lens - unit made of durable plastic 50x Power magnification - easy focusing ability - no focus knob, etc. End has opaque encasing to limit brightness of light on surrounding objects