EOTech is one of the most trusted manufacturer of military and civilian weapon sights and accessories, and the  is the perfect example of why. The HHS II combines the popular EXPS2 with the innovative G33 3X magnifier and Switch-To-Side mount. Both of these units work seamlessly together and offer quick-detach, locking mounts. The EXPS2 is among the most compact units available requiring minimal rail mounting space. When combined with the G33 magnifier the entire HHS II units measure a mere 8.1" and requires only 2.75" of rail space for mounting. When faced with variable situations the HHS II is the ideal choice with the ability to quickly switch from 1x to 3x with the flip of a finger. The G33 is held in place with a strong detent that maintains its perfect alignment with the EXPS2, and hold the unit out of the operator's way in CQB situations. Perfect for any situation, the HHS II offers 20 illumination intensities, anti-glare coatings with high light gathering capability, true holographic transmission for a parallax free optic that features a true heads-up display for shooting with both eyes open. The only thing that will outlast the 600 hour battery life is the EOTech Limited Lifetime Warranty.