Steiner OTR IR Laser. The OTAL “Offset: Tactical Aiming Laser” IR features a low-profile and lightweight design with an infrared laser that when used with night vision devices will engage targets out to 250 meters. The Class I IR beam projects around the front sight. The Quick Release HT mount fits any 1913 or Picatinny rail. Class 1 Eye Safe Operation. Powered by: One AA Battery. Weight 5.6 oz. Dimensions 3.6in x 1.7in x 1.6in. Quick Release HT Mount. Fully Adjustable Windage / Elevation. Remote Cable Pad Activation. Momentary or Constant On Operation. Wavelength IR Laser 850nm +/-3%. Beam divergence IR laser 0.5+/-0.3 mRad. Range/Visibility (Night/Day) – IR Laser. Temperature -40° C to +65° C. Low-profile single laser for mounting in front of optics, offset to avoid front sight posts.