The Telrad Pulser will greatly increase the battery life for your Telrad and in addittion it improves contrast by pulsing the reticle image on and off thus aiding in locating faint objects. Following the simple instructions you can easily install the pulser in a short time. Once installed, the original control knob still controls the power and brightness, and the new control knob will control the pulse speed of the reticle image. You can vary the pulse frequency from very slow to having the reticle image constantly on.