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Questions & Answers
is there a way to turn of the shake awake feature? Expert Answer

Yes, if you refer to your instruction manual it will provide a way to turn the "Shake Awake" feature off. This is the generic instructions provided by Holosun:

The default sleep timer setting is 10 min, but can be adjusted
1) Press and hold the “+” button for 10 seconds to enter time adjustment mode. There are 4 options: 10 min, 1h, 12h or the sleep mode is disabled.
2) Press and release either “+” or “-” button to set the time. The LED will blink (1=10 min,2=1h, 3=12h, or4=disable sleep mode.
3) Press the “+” and “-” buttons simultaneously to save the time setting and power off the sight

by Armando R., Gear Expert, March 11, 2020
The description says “parallax-free”,but the red dot I received is definitely NOT parallax-free.The red “dot” is also more like a smudge. This Normal? Expert Answer

If the red dot looks like a smudge, you might have what is called a stigmatism which blurs those types of dots, I have a stigmatism and experience the same thing.

by Ben, Gear Expert, January 22, 2021
Customer Reviews
Helpful Positive Review Holosun easy to set up, and very easy to use. by Ziggy, Verified Owner, April 11, 2024
I like this Holosun Paralow HS403B 1x20mm 2 MOA Red Dot Sight very much. It was reasonable priced and easy to use and sight in. I have this on my bedroom anti-home invasion weapon. I did recommend this and my buddy bought two.
1/1 found this helpful
Helpful Positive Review Great Red Dot by A.Feaze, Verified Owner, May 25, 2024
Holosun 403B is a great red dot and works well. Worth it especially on sale!
1/1 found this helpful
Helpful Positive Review Great red dot by XtwebbyX, September 5, 2024
Great red dot. Dot has multiple brightness settings, which is nice.
1/1 found this helpful
Helpful Positive Review Holosun Red Dot by Matteo, Verified Owner, October 13, 2024
Not a bad sight. Mainly wanted it because it came in FDE to match l a build I was working. Could probably find a similar quality red dot for less, but overall does the job. Note that it is a lower 1/3 sight, so will not absolute co-witness.
1/1 found this helpful
Helpful Positive Review Best bang for your buck by Joe, Verified Owner, November 11, 2024
This optic has what you need for most situations, it is at a great price for what you get and it is easy to use and install.
1/1 found this helpful
Helpful Positive Review Very pleases as always with Holosun products. by Miket.435, Verified Owner, January 19, 2025
I own 5 Holosun red dots and a 3X magnifier and have been very pleased with all at a great price. I bought the HS403B in FDE for my Ruger takedown in the FDE Magpul Backpacker stock equipped with the TacSol fluted barrel in Quicksand color. The FDE o...
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1/1 found this helpful
Read All 213 Reviews

Best Rated Product

Our customers have spoken – this is one of the best rated products in the Red Dot Sights & Accessories category! See more best rated Red Dot Sights & Accessories products
Color: Flat Dark Earth Reticle: 2 MOA Dot Illumination Color: Red Included Accessories: 1/3 Co-witness Mount , Low Mount Condition: New Quantity: 1 Red Dot Sights-Footprint: Not Applicable

Code: 28Y-RD-PRLWRDS-HS403B-FDE

MPN: HS403B FDE

UPC: 605930624762

List: $211.75Save 36%
$134.79
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Product Info for Holosun Paralow HS403B 1x20mm 2 MOA Red Dot Sight

The Holosun Paralow Lightweight Red Dot Sight is packed full of features and design qualities that make this a versatile must-have for any shooter, whether you're on the range or in the field. These Red Dot Sights by Holosun allow you to have greater situational awareness with the ability to shoot with both eyes open using the parallax-free 2 MOA dot to acquire your target. It breaks the mold with an innovative 50,000 hour battery life and an auto wake feature that turns the scope on when it's moved and has an adjustable auto shut-off. The high-grade aluminum construction and weather-resistant finish is waterproof down to 1m, so you can take your Holosun Paralow Waterproof Red Dot Sight everywhere you go in any extreme weather condition. Reduce your training time and increase your accuracy with the Holosun Paralow Compact Red Dot Sight.image

WARNING: California`s Proposition 65

Specifications for Holosun Paralow HS403B 1x20mm 2 MOA Red Dot Sight:

Manufacturer: Holosun
Color: Flat Dark Earth
Finish: Micro Arc
Fabric/Material: CNC Aluminum
Magnification: 1 x
Objective Lens Diameter: 20 mm
Reticle: 2 MOA Dot
Illumination Type: LED
Illumination Color: Red
Eye Relief: Unlimited
Adjustment Click Value: 0.5 in at 100 yds
Emitter Type: Enclosed
Lens Material: Glass
Optical Coating: Multi-Layer Reflecting
Battery Type: CR2032
Battery Life: Up to 5 years
Operating Temperature: 22 - 140 Fahrenheit
Water Resistance Level: Waterproof
Water Resistant Mark: 1 m
Length: 63 mm
Width: 30 mm
Height: 58 mm
Weight: 124 g
Included Accessories: Low Mount, 1/3 Co-witness Mount
Condition: New
Package Type: Box
Magnification Type: Fixed
Brightness Index: 2NV / 10DL
Quantity: 1
Tube Diameter: 22 mm
Red Dot Sights-Footprint: Not Applicable
Co-Witness: 1/3 Co-witness
Attachment Type: Quick Detach, Low Profile
Housing/Frame Material: 6061-T6 aluminum
Adjustment Range: 0.5 MOA
W/E Travel at 100 Yds: 50 MOA

Features of Holosun Paralow HS403B 1x20 mm 2 MOA Red Dot Sight:

  • Designed for day and night use
  • Advanced LED technology allows for up to 50,000 of operation
  • 2 MOA dot size
  • Parallax-free with unlimited eye relief
  • Unaffected by extreme weather conditions
  • Rugged and reliable aluminum construction
  • All lenses have multi-layer coatings
  • Improved motion-activated "Shake Awake Technology"
  • Multiple brightness settings
  • Durable PEO/MAO finish

Package Contents:

  • Holosun Paralow Red Dot Sight, 2 MOA Dot, Parallax-Free
  • Lower 1/3 Co-witness Mount
  • Low Profile Mount
  • T10 L Key
  • Rubber Cover
  • User Manual
  • CR2032 Battery
  • Lens Cloth

Holosun Paralow HS403B 1x20mm 2 MOA Red Dot Sight Orderable Models

List of Orderable Models

Holosun Red Dot Sight 1x20mm, 2 MOA Dot, Flat Dark Earth, HS403B-FDE , MPN: HS403B FDE , UPC: 605930624762 , Code: 28Y-RD-PRLWRDS-HS403B-FDE

Holosun Paralow HS403B 1x20mm 2 MOA Red Dot Sight Unavailable & Discontinued Models

List of Unorderable Models

Holosun Paralow Red Dot Sight, 2 MOA Dot, Parallax-Free, Under Mount Battery, HS403A , MPN: HS403A , UPC: 760921087305 , Code: 28Y-RD-PRLWRDS-HS403A
Holosun Paralow Red Dot Sight 1x20mm, 2 MOA Dot, Parallax-Free, Battery Tray, HS403B , MPN: HS403B , UPC: 760921087428 , Code: 28Y-RD-PRLWRDS-HS403B
Holosun LED Red Dot Sight w/Kinetic Development SIDELOK Aimpoint Micro Mount Lower 1/3 Co-Witness, Flat Dark Earth , MPN: HS403B-FDE-KIT1 , Code: 28Y-RD-PRLWRDS-HS403B-FDE-KIT1
Holosun LED Red Dot Sight w/Low and Co-witness Mounts W/ Kinetic Development SIDELOK Aimpoint Micro Mount Lower 1/3 Co-Witness, Black , MPN: HS403B-KIT1 , Code: 28Y-RD-PRLWRDS-HS403B-KIT1

Proposition 65 Warning for California Consumers

For more information go to www.p65warnings.ca.gov

Notification

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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