Technical specifications:
| MODEL | DT-NH821D | 
| Generation | Gen 2+/Gen3(optional) | 
| Magnification | 1X(3X/4X/5X) | 
| Resolution ( lp/mm) | 60-64 | 
| S/N (dB) | 18-24 | 
| FOV(°) | 42+/-3 | 
| Capability | Flip-Up On-Off, Side Flip-Up On-Off | 
| Automatic Brightness Control | YES | 
| Bright Light Cut-off | YES | 
| Infrared Illuminator | Built-in(850nm 20mW) | 
| IR Indicator | YES | 
| Low Battery Indicator | YES | 
| Adjustable range of eye distance | 65+/-5mm | 
| Diopter | +5/-5 | 
| Range of focus (M) | 0.25–∞ | 
| Material | Aviation aluminum | 
| Power supply | 2.6-4.2V | 
| Battery type | CR123(A)x2 | 
| Operating Temperature (℃) | -40/+50 | 
| Relative Humidity | 5%-98% | 
| Waterproof | IP65(IP67 optional) | 
| Dimensions(mm) | 115x127x69 | 
| Weight(no battery) | 460g(housing)/610g(finished) | 
 
            