Tactical FOV 50 /40 Degree Night Vision Goggles and No Distortion Binoculars

Model: DTS-31N

Short Description:

Product Description:


DTS-31N  is a high-performance military head mounted night vision binocular built by Detyl Optoelectronics with reference to pvs-31, an active head mounted night vision binocular in the United States. The DTS-31n has the characteristics of super large field of view, high definition, no distortion, light weight, high strength (the overall performance is much better than the original version of the U.S. military products), which is the ideal choice for military night equipment.



Technical specifications:

Generation Gen 2+/Gen3(optional)
Magnification 1X
Resolution 63-70 lp/mm
FOV° 50+/-2  (40 optional)
Diopter + / – 5
Capability Flip-Up On-Off, Side Flip-Up On-Off
Optical distortion 0.5% Max
Automatic Brightness Control YES
Bright Light Cut-off YES
Infrared Illuminator Built-in(850nm 20mW)
IR Indicator YES
Low Battery Indicator YES
Power Supply CR123A
Battery Life 60 h – standard/ 300 h – with Battery Pack (optional)
Distance of pupil 30mm
Eyepiece aperture 8mm
Eye distance adjustment range 50-80mm
Operating temperature -40–+55℃
Relative humidity 5%-95%
Waterproof IP65/IP67
Dimensions 115mmx178 mm x 85mm
Weight 452g(housing )/523g(finished)

Product Detail

Product Tags

Product Details

DTS-31N is a high-performance military head mounted night vision binocular built by Detyl Optoelectronics with reference to pvs-31, an active head mounted night vision binocular  in the United States.  Low light DTS-31N has the characteristics of super large field of view, high definition, no distortion, light weight, high strength (the overall performance is much better than the original version of the U.S. military products), which is the ideal choice for military night equipment.

Technical Specifications:



Structural mode

Arbitrary turn it over

rollover detection

Automatically detect and power off when turning up

Battery type

Lithium battery (cr123x1) / cr23x4 external battery box

Power supply



Head mounted(standard American helmet interface)

control mode


Over power consumption


Battery capacity


Battery life





50 +/-2

Parallelism of optical axis

<0.1 °



Lens system

F1.18  22.5mm



Optical distortion

3% Max

Relative Illumination



Multilayer broadband coating

Range of focus


Focus mode

manual focus facility

Distance of pupil


Eyepiece aperture


Range of visibility

0  (+ / - 5 optional)

Eye spacing adjustment

Arbitrary continuous adjustable

Eye distance adjustment range


Eye distance locking method

Manual locking

Frame rate


Low sensitivity


Image resolution


Display resolution


SD card


Other functions


1. Battery installation

The CR123 battery (reference battery mark) is shown in Fig. 1 Tack the attery into night vision battery cartridge. Lets battery cover and batteryCartridge’s  screw thread together ,Then clockwise rotation and tightened to complete the battery installation.


2. On/ off setting

As shown in Fig. 2, Turn the work switch along the clockwise direction.The knob indicates the location of "ON", when the system starts to work.


3. Eyepiece distance adjustment

As shown in Fig. 3, connect the bracket as the axis, and hold both
sides of the night vision instrument with both hands
Rotate clockwise or anticlockwise. Different users can use it
according to their own Adjust the distance between eyes and
comfort until it is suitable for the distance between eyes.


4. Eyepiece adjustment

Choose a target with moderate brightness. The eyepiece is adjusted
Without opening the lens cover. As in Figure4, Turn the eyepiece
hand wheel clockwise or counterclockwise. To match the eyepiece,
when the most clear target image can be observed through an eyepiece,


5. Objective lens adjustment

The objective adjustment is need to see the target at different distances.
Before adjusting the lens, must adjust the eyepiece according to the abovemethod. When adjusting the objective lens, choose a dark environment target. As shown in Figure 5,Open the lens cover and aim at the target.
Turn the focusing hand wheel clockwise or counterclockwise.
Until you see the clearest image of the target, complete the adjustment of the objective lens. When observing targets at different distances, the objective needs to be adjusted again according to the above method.

6. Operation Mode

The working switch of this product has four gears. There are four modes in total, except OFF.
There are three modes of work: ON, IR and AT. Corresponding to normal working mode, infrared auxiliary mode and automatic mode, etc.

7. Infrared mode

The environmental illumination is very low (all black environment). When the night vision instrument cannot observe clear images, The working switch can be turned clockwise to one shift. As shown in Fig. 2, The system enters the "IR" mode. At this time, the product is equipped with infrared auxiliary lighting to turn on. Ensure normal use in all black environments.
Note: in IR mode, similar equipment is easy to be exposed.

8. Auto Mode

The automatic mode is different from the "IR" mode, and the automatic mode starts the environment detection sensor. It can detect environmental illuminance in real time and work with reference to illumination control system. Under extremely low or extremely dark environment, The system will automatically turn on infrared auxiliary lighting, and when the environmental illumination can meet normal observation, The system automatically closes "IR", and when the ambient illumination reaches 40-100Lux, The whole system is automatically shut down to protect the photosensitive core components from damage by strong light.


9. Head mounted installation

First, set the device of helmet mount to unlocking state,
as shown in figure ⑥ - 1.Push the lock catch of the helmet
hanging device to the right to make the lock cylinder spring back
The status of helmet hanging device is as shown in figure ⑥ - 2.

Align the fastener of helmet mount with the general
equipment card of soft helmet.The groove is as shown
in figure ⑥ - 3. At the same time, push the lock catch
of the helmet hanger to the left.Move to make the lock
cylinder pop out and lock the helmet in the state of ⑥ - 4.


After the equipment of helmet mount is installed on the helmet,
align the general fixture of the night vision instrument with one end of the eyepiece
Press the device slot of helmet hanging parts inward as ⑥ - 5,
until the sound of "click" is heard, and confirm there is no looseness.
you can let go and the night vision instrument is assembled.
(Note: when disassembling this product on the equipment of helmet mount,
as shown in the figure⑥ - 5, press the button indicated by the orange arrow
in the orange circle)


10. Head mounted adjustment

To ensure the comfort of users when using this system, the helmet mounted system has designed a perfect fine-tuning structure to meet the needs of different users.

Up and down adjustment: when it is necessary to adjust the up and down distance between the night vision eyepiece and the human eye, first turn the locking knob to unlock in the direction of the open marking, and then adjust the product eyepiece to the most suitable height for observation, then turn the locking knob to lock in the direction of the lock marking to complete the up and down adjustment, as shown in figure ⑦ Brown figure.

Fore and aft adjustment: when adjusting the front and rear distance of night vision eyepiece and human eye, at the same time, hold the front and rear adjustment buttons on the left and right sides of the night vision device, do not let go, turn the night vision device back and forth,
adjust to the appropriate position, release the hand and it will lock automatically, and adjust before and after, as shown in Fig.

Flip fine tuning:There are two gears for turning the fine adjustment knob.
When the knob is rotated 180 degrees clockwise or anticlockwise, the distance between the night vision goggle and the human eye can be turn the fine adjusted. As shown in figure ⑦ blue.


11. Head mounted flip

After the product has been dressed, in the actual use process, If the night vision device is not used for a while, night vision device can be flipped over the helmet. This does not affect the current line of sight, and is convenient to use at any time. When naked eyes need to observe, press the reversal button of the helmet mount, then turn the night vision assembly upward. , When the angle reaches 170 degrees, loosen the reversal button of the helmet mount, the system will automatically lock the reversal state. When you need to put down the night vision module, you also need to press the flip button of the Helmet Pendant first. The night vision module will automatically turn back to the working position and lock the working position. When the night vision module is turned over to the helmet, the system night watch will be turned off automatically. When turning back to the working position, the night vision system will automatically turn on. And work normally. As shown in Fig.
The product can also be turned left and right in the use process.

When only one eye observation is needed, the other side that does not need to be used can be turned left or right, which is convenient for the user to observe with one side naked eye and one eye night vision instrument. When the night vision device is flipped to the helmet on one side, the system night visio device on the flipped side will be automatically turned off.

When it is turned back to the working position, the night vision device system will automatically turn on and work normally. As shown in figure ⑨.


12. power supply

This product has a built-in backup power interface.
When the built-in battery is low,The user can connect the backup power through the power connection port. As shown in Figure 10.

Common Questions:

1.No power
A. please checks whether the battery is loaded.
B. checks whether there is electricity in the battery.
C. confirms that the ambient light is not too strong.

2. Target Image is not clear.
A. check the eyepiece, whether the objective lens is dirty.
B. Check the lens cover open or not ?if at night time
C. confirm whether the eyepiece is properly adjusted (refer to eyepiece adjustment operation).
D. Confirm the focusing of the objective lens ,whether finished adjusted.r (referring objective lens focusing operation).
E. confirms whether infrared light is enabled when the environments all back.

3. Automatic detection not working
A. automatic mode, when glare automatic protection does not work. Please check if the environmental testing department is blocked.
B. flip, the night vision system does not automatically turn off or install on the helmet. When the system is in normal observation position, the system cannot start normally. Please check the position of the helmet mount is fixed with the product. (reference headwear installation).


1. Anti-strong light
The night vision system is designed with automatic anti-glare device. It will automatically protect when encountering strong light. Although the strong light protection function can maximize the protection of the product from damage when exposed to strong light, but repeated strong light irradiation will also accumulate damage. So please do not put products in strong light environment for a long time or many times. So as not to cause permanent damage to the product.。

2. Moisture-proof
The night vision product design has waterproof function, its waterproof ability up to IP67 (optional), but long-term humid environment will also slowly erode the product, causing damage to the product. So please store the product in a dry environment.

3. Use and preservation
This product is a high precision photoelectric product. Please operate strictly according to the instructions. Please remove the battery when it is not used for a long time. Keep the product in a dry, ventilated and cool environment, and pay attention to shading, dust-proof and impact prevention.

4. Do not disassemble and repair the product during use or when it is damaged by improper use. Please
contact the distributor directly.

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