| Parameter | Details |
|---|---|
| Illumination Form | Large Spot, Middle Spot, Small Spot, Red Free |
| Diopter Compensation | 0, ±1, ±2, ±3, ±4, ±5, ±6, ±8, ±10, ±12, ±16, ±20, -25, -35D |
| Illumination Source | 2.6V/0.78W, Incandescent Bulb |
| Power | 2# Alkaline battery, rechargeable battery |
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