Specifications:
Illumination form：Large light spot(Φ 3.2mm), Small light spot (Φ 1.6mm)Slit,Central-net, Red-free filter
Diopter compensation：0、±1D、±2D、±3D、±4D、±5D、±6D、±8D、±10D、±12D、±16D、±20D、-25D
Illumination bulb：3.6V/2.6W Mini-halogen bulb
Power supply：Li-on battery
Input power：5VA
