The buck alert motion sensing system allows the hunter to detect movement on any chosen trail or in a particular area. Every hunter has been "busted" by an animal that has gotten too close. Now you have the advantage with the BUCK ALERT! The Buck Alert will alert you to an approaching animal by sending a signal from the motion detector to your hand held device/receiver. After receiving the signal, simply position yourself and get ready to take the shot. Great for covering blind spots, well traveled trails and shooting lanes. You can use up to three different motion detectors per receiver, each one will be set to a different color light so you will know which one went off and where to look. Typical range is around 80 yards but could be affected by various things such as weather, terrain, etc. Works for all seasons. Season long battery life.