The night vision device has a built-in infrared auxiliary light source and an automatic anti-glare protection system. It has strong practicability and can be used for military observation, border and coastal defense reconnaissance, public security surveillance, evidence collection, customs anti-smuggling, etc. in the night without lighting. It is an ideal equipment for public security departments, armed police forces, special police forces, and guarding patrols. The distance between the eyes is adjustable, the imaging is clear, the operation is simple, and it is cost-effective. The magnification can be changed by changing the objective lens (or connecting the extender).

MODEL	DT-NH921	DT-NH931
IIT	Gen2+	Gen3
Magnification	1X	1X
Resolution	45-57	51-57
Photocathode type	S25	GaAs
S/N(db)	15-21	18-25
Luminous sensitivity(μa-lm)	450-500	500-600
MTTF（hrs）	10,000	10,000
FOV(deg)	42+/-3	42+/-3
Detection distance(m)	180-220	250-300
Adjustable range of eye distance	65+/-5	65+/-5
Diopter(deg)	+5/-5	+5/-5
Lens system	F1.2, 25mm	F1.2, 25mm
Coating	Multilayer broadband coating	Multilayer broadband coating
Range of focus	0.25--∞	0.25--∞
Auto anti strong light	High Sensitivity, Ultra Fast, Broadband Detection	High Sensitivity, Ultra Fast, Broadband Detection
rollover detection	Solid non-contact automatic detection	Solid non-contact automatic detection
Dimensions (mm) (without eye mask)	130x130x69	130x130x69
material	Aviation aluminum	Aviation aluminum
Weight (g)	393	393
Power supply  (volt)	2.6-4.2V	2.6-4.2V
Battery type (V)	AA(2)	AA(2)
Wavelength of infrared auxiliary light source (nm)	850	850
Wavelength of red-explode lamp source (nm)	808	808
Video capture power supply (optional)	External power supply 5V 1W	External power supply 5V 1W
Video resolution (optional)	Video 1Vp-p SVGA	Video 1Vp-p SVGA
Battery life (hours)	80(W/O IR)    40(W/IR)	80(W/O IR)    40(W/IR)
Operating Temperature (C	-40/+50	-40/+50
Relative humidity	5%-98%	5%-98%
Environment rating	IP65（IP67 Optional）	IP65（IP67 Optional）

 The purpose of objective lens adjustment to see clearly at different distances. Before adjusting the objective lens,Please adjust the eyepieces first according to the aforementioned method. When adjusting the objective lens, please select a darker environment. As shown in Figure ④, open the objective lens cover, aim at the target, and turn the objective lens focusing handwheel clockwise or counterclockwise until the clearest environment image is seen, and the objective lens adjustment is completed. When observing targets at different distances, the objective lens needs to be adjusted again according to the aforementioned method.When the ambient illuminance is very low (full black environment), and the night vision device cannot observe a clear image, you can turn the work switch clockwise to another gear. the system enters the "IR" mode. At this time, the built-in infrared auxiliary lighting of the product is turned on to ensure normal use in a completely dark environment. Note: In the infrared mode, if you encounter similar equipment, it is easy to expose the target.