TECHNICAL SPECIFICATIONS Model: B-157R Head: Binocular Eyepiece: WF10x/18mm Objectives: Achromatic 4X/10X/40X/60X Stage: Mechanical stage, 125x116mm with specimen holder Focusing: Coaxial coarse and fine focusing mechanism with limit stop Condenser: 1.2 N.A. with diaphragm Illuminator: 1W LED with external power supply Power supply: Input Voltage: 100-240Vac / 50-60Hz Output: 5Vdc 500mA (B-150R model: 6Vdc 2,5A) Internal NiMH rechargeable battery (B-150R models only)