.22LR is the only version with a rechargeable battery. Calibers other than.22LR will come with regular batteries.Not only is the Sightmark Laser Boresight tested and recommended by the National Tactical Officers Association, but it's known to significantly reduce wasted cartridges and shells. With a durable brass material and on/off operation cap, this boresight is built for quick sighting with a compact and lightweight construction. To use this boresight, all you'll have to do is add this boresight to the chamber of your rifle, then the red laster dot will appear where you're aiming. Choose the Sightmark Laser Boresight today, to take your hunting experience to the next level. Features:Specs:Includes:.