The HWS has been designed and tested to provide consistent, reliable performance even in the most hostile operational environments. It is waterproof, fog proof, shockproof, and temperature proof.
The HWS is designed to withstand Mil-Spec drop tests and still remain fully operational and hold zero. The HWS has been extensively tested in a punishing recoil simulator generating 3,500 G's of acceleration in less than 0.5 milliseconds (the recoil of a .454 Casull revolver) as well as various environmental chambers).
The Heads Up Display is constructed with a 3 layer, shatterproof laminate glass that is 3/16" thick for added durability. Additional protection of the Heads Up Display is provided with a "roll bar" ruggedized hood.
All optical surfaces are flat and treated with anti-reflective coatings eliminating additional muzzle side signature due to reflective glare. No need for costly glare elimination filters that reduce the effective light transmission and further dim the target area.
The HWS employs a true Heads-Up Display that eliminates blind spots, constricted vision, or the tunnel vision associated with tube sights. All user controls are flush to the HWS's streamline housing with no protruding knobs, battery compartments or mounting rings blocking vision at the target area. True, 2 eyes open shooting is realized. Instant threat identification is achieved by maximizing the operator's peripheral vision and ultimately gaining greater control of the engagement zone.
In holography, all the information required to reconstruct the reticle image is recorded everywhere in the Heads-Up display window. If the window is obstructed by mud, snow, rain, etc., the HWS remains fully operational , with point of aim/impact being maintained. Even in such extreme cases where the laminated window is shattered, the HWS is fully functional! As long as the operator can see through any portion of the window, the entire reticle pattern is visible on target...the operator can still engage with confidence.
ELECTRONIC FEATURES
All electronic controls are via push-button switches located at the rear of the unit housing as shown in Figures 1. To ensure proper operation of the push button switches we recommend pressing firmly on the center of the switch.
1. ON/ AutoBattery Check
Depressing the Up or Down Arrow push-button switches will turn the sight ON at Level 12. (For the Model 554, the sight will turn on at Level 12 when the UP but- ton is depressed and it will turn on at Level 1 when the DOWN Button is depressed). See step 4 under this section for description of Auto shutdown.The sight will automatically perform a battery check everytime it is turned on. If the batteries have less than 20% of life left, the sight will turn on with the reticle image blinking on and off for 5 seconds. If the remaining battery life is more than 20%, the sight will turn on with a steady reticle pattern. The battery condition can be checked any time by turning the sight off and back on.
2. OFF
To turn the sight off depress both UP and DOWN arrows simultaneously. Verify by looking through heads-up display window.
3. Brightness Adjustment
Push-button switches vary the brightness intensity of the holographic reticle pat- tern. Depressing and releasing the push-button switches moves the brightness level UP or DOWN one (1) step from the previous setting. Depressing and holding the up arrow or down arrow switch will change brightness level up or down continu- ously in steps. There are twenty (20) brightness settings providing a dynamic range of 146,000:1 from the lowest setting to the highest setting.
4. Auto Shutdown
The HWS is equipped with auto shutdown capability. If the sight is turned on by depressing the UP button, it will automatically shut itself OFF 8 hours after the last push-button control is used. The sight will automatically shut OFF after 4 hours if it is turned on by depressing the DOWN button. (The Model 554 will auto- matically shut OFF after 8 hour whether the sight is turned ON by depressing the UP or the DOWN button.)
WINDAGE AND ELEVATION ADJUSTMENTS
Your HWS features click mechanisms for elevation and windage adjustments. The elevation and windage adjustment are located on the Right-hand side of the sight. The knob towards the front is your windage adjustment and the knob towards the rear is your elevation adjustment. Both of these adjustment mechanisms are grooved with a slotted screw head and require the use of a screwdriver, coin, or spent brass to turn.
LASER SAFETY
The HWS is a Class II laser product. The Class II level illuminating beam, however, is completely blocked by the housing. The only laser light accessible to the eye is the image beam and is at a power level within the limit of a Class IIa laser product.
*Information per online owners' manual.
EOTECH 552 
