Regardless of the scenario this HHS provides an unparalleled advantage when transitioning from short to long range shooting. The EXPS2-2 offers true 2 eyes open shooting, a transversly mounted lithium 123 battery, 7 mm raised base offering iron sight access, and easy to adjust side buttons. The G33 3x magnifier with switch to side mount provides superior light transmission and the large field of view puts the competition to shame. Both units offer an adjustable, locking, quick detach lever for easy attachment and removal. 3x magnifier with Switch-To-Side mount works with all existing HWS units. Reticle is a 65MOA circle with two 1MOA aiming dots Singl Mfg: Eotech SPECS: EXPS2-2: Optics: Transmission holography - parallax free Magnification: 1x Eye Relief: Unlimited COMBINED Length/Width/Height: 8.1"x 2.2"x2.8" (206 x 55.9 x 71.1mm) COMBINED Weight: 23.1 oz (655 grams) Temperature: -40 to 160 F