| SPECIFICATIONS |
| Model | UND-31N | UND-31D |
| Image Intensifier | Gen2 (Gen3) | CMOS |
| Optical Magnification | 1X | 1X |
| Resolution Ratio | 120lp/mm | 160lp/mm |
| Field of View | 50° | 25° |
| Visual Scope Adjustment Range | +5~-5 | +5~-5 |
| Lens System | F1.18 22.5mm | F1.6 7.8mm |
| Optical Coating | Ubroadband multilayer optical penetration film |
| Objective Adjustment Range (m) | 0.25~∞ | 0.25~∞ |
| Automatic Anti-Strong Light | Automatic detection, turn up and shut down |
| Flip Detection | High-sensitive,super-fast,and broadband detection |
| Dimensions | 115x105x85 |
| Weight | 560g | 430g |
| Power Supply Voltage | 2.6~4.2V | 2.6-4.2V |
| Battery Type | Lithium battery (CR123x1) / CR23x4 external battery case | Lithium battery (CR123x1) / CR23x4 batterycase |
| Continuous Working Hours | 40-100h | 0.5-3h |
| Operating Temperature Range | -40℃--+55℃ | -30℃--+50℃ |
| Relative Humidity | 5%-95% | 5%-95% |
| Dust And Waterproof Grade | IP65/IP67 | IP65/IP67 |
