ULTRA-RELIABLE OPERATION FOR YOUR DRIVEWAY ALERT: The Dakota Alert DCPA-4k Plus driveway alarm sensor operates on three CR-123 batteries (included), which typically last a year or more before needing to be changed. With battery operation day and night, there is no need to worry about a solar panel not charging, ensuring reliable operation at all times. 16 DIFFERENT TUNES FOR YOUR DRIVEWAY ALERT: The RE-4k Plus receiver will play one of 16 different tunes when a signal is received from the DCPT-4000 vehicle sensor, providing an audible alert of a detected vehicle. Additionally, the receiver also has two form C relay outputs and one 12 VDC output, which can be used with other accessories. LONGEST WIRELESS RANGE IN ITS CLASS: The one-mile wireless range of the Dakota Alert DCPA-4k Plus driveway alarm is the longest in its class, providing a signal that is much more likely to get through to the receiver compared to other products that only offer ¼ mile or ½ mile. EASY INSTALLATION OF YOUR DRIVEWAY ALARM: Installing the Dakota Alert RE-4k Plus driveway alarm sensor is easy, and up to 16 sensors can be paired with one receiver or an unlimited number of receivers can be paired to one sensor. This makes the driveway alarm highly customizable to your needs and can be set up in minutes with its simple code-learning technology. DRIVEWAY ALARM WITH ONE-MILE WIRELESS RANGE: The Dakota Alert DCPA-4k Plus driveway alarm is designed with a one-mile wireless range between the sensor and receiver, providing maximum coverage and eliminating false signals from non-vehicle sources such as deer and other large animals.