The 1/2 Mile Hosmart Driveway Alarm Wireless Sensor is an add-on sensor for driveway alarm systems. It comes in a brown color and features wireless connectivity, making it easy to install without the need for complicated wiring. The sensor is designed by H HOSMART and is compatible with the HY-001B model. This sensor is ideal for enhancing home surveillance and security, providing reliable detection of motion and activity in driveways or other outdoor areas within a half-mile range.