The secret to the success of the Bone Collector line of products really is not a secret at all. In a nutshell, its excellence in research and development, quality craftsmanship, lethal precision and sleek styling that is second to none. The Bone Collector Laser Rangefinder incorporates single button operation with lightning fast ranging, with +/- one yard accuracy. And they are tough and are 100% waterproof, fog-proof and shockproof. With the Bone Collector logo stylishly detailed into the body adds another level of class to this sleek Bushnell product.It's definitely no surprise all the Bone Collector products are the choice of the Bone Collector TV hunters, as well as hunters just like you. Includes:CR2 battery Features+/- One yard accuracySimple one-button operationLightning fastRainproof