Want to know when someone's coming up your driveway before they even reach the door? This HTZSAFE Wireless Driveway Alarm system is a simple, effective solution. It comes with one plug-in receiver for inside your house and TWO outdoor motion sensors. The sensors have a crazy long wireless range—up to 1/2 a mile in ideal conditions! They're weatherproof too, working from -30°F to 150°F, so winter or summer, they've got you covered. Each sensor detects motion across a 50-foot wide area (adjustable to 35 ft to avoid small animals). When it detects a person, car, or large animal, it sends a signal to the receiver, which plays one of 35 different chimes (you can set different sounds for different sensors). Install is plug-and-play: just add 3 AA batteries (not included) to each sensor, plug the receiver into an outlet, and mount the sensors on a tree, fence, or wall. You can expand the system up to 32 sensors! Great for monitoring driveways, gates, sheds, pools, or even as a mailbox alert. Get peace of mind without a complicated security system.