The Sightmark Laser Boresight provides the most convenient and accurate method for sighting in bows and crossbows. Simply screw on the boresight to the tip of an arrow or bolt and a laser dot will show exactly where the bow or crossbow is aiming. Next, sight in any optic at 30 yards and switch out the boresight for an arrow or bolt tip to begin hunting. The Sightmark Laser Boresight is sure to take the frustration out of prolonged sighting, as it is easy to use and will save both time and money. A lightweight carrying pouch protects the laser for convenient use in the field. Sightmark-Make Your Mark! Note Boresight accuracy depends on straightness of arrows. Features Precision Accuracy Reliable and Durable Attaches to arrows or bolts Compact and lightweight Easy to pack and travel Included in Package Battery Pack Carrying Case Specifications Laser Wavelength nm 632-650 Output Power 5 Mw Battery Type 2 x AG5 or 3 x AG3 Battery Life 1 Hours Range for Sighting 15 to 100 yards Dot Size 2 100 yards Operation On/Off End Cap Construction Brass Operating temperature F 15 to 120 SOLD QUANTITY 1