Description Feature: The well positioned filament can rotated up to 360° and move upward and downward. Brightness of the streak can be adjusted. Quickly and precisely measure the astigmatism axis. The light can be converged, radiated and paralleled. Quick and convenient recharging, against over recharging. Zoom illumination adjustment.SPECIFICATIONS Illumination Source: 3.5V/2.8W，Halogen Bulb. Power Supply: Charger, AC220V/ 50Hz or AC110V / 60Hz Battery: Lithium battery DC:3.7V. Power Input: 20VA
