Specifications
Illumination Form	Big spot, middle spot, small spot, slit, central network, red-free
Diopter Compensation	+/- 0, 1, 2, 3, 4, 5,  8, 10, -12, 15,-20
Illumination Source	2.5V/ 1.6W haolgen bulb
Charge	two AA size alkaline or rechargeable batteries