Easy to install and expand: This wireless solar driveway alarm system is easy to install. It can be installed on walls, fence posts, trees, or any other surface. It will provide 24-hour motion detection to protect your family's property and safety. A single receiver can expand/handle up to 16 motion sensors. To provide full coverage of your property. Flexible operation and long-distance communication: The wireless motion sensors can work together with receivers or independently. The communication range from each sensor to the receiver can reach up to 1/2 mile (1500 feet). You can also use this motion detector as your remote driveway doorbell. The motion detection range can reach up to 30 feet. Wide Range of Uses：The driveway alarm system includes a receiver and a motion sensor with waterproof grade of IP65 for outdoor alert use. The motion sensor is using the most advanced pyroelectric infrared (PIR) technology to detect the heat source of moving object and use new software algorithms to minimize false alarms caused by environmental impacts. You can quickly receive motion alarms when people, cars and/or animals enter your driveway or wherever you place a sensor. Solar powered: This motion sensor is powered by a battery, which is charged through the existing solar panel. So, there is no need to be continually replacing the battery. It can also be charged through a USB-C cable. Our driveway alert system has undergone rigorous testing in high and low temperature environments and has a working temperature range of -4°F to +140°F (-20°C to +60°C). Alert Options：You can select one of 4 ways of being alerted (Audible Alarm/Light Alarm/Sound Light Alarm/Work with Receiver). These will effectively alert you to visitors and potentially unwanted intruders., Weight: 0.78925489796 pounds, Manufacturer: Betterlink