Swann SWADS-ALARMS is an easy-to-use wireless alarm kit that provides peace of mind for homes and businesses. It features two PIR Alert Motion Sensors that detect movement up to 40 feet away and a Speaker Receiver Unit that emits an audible alarm and lights up when motion is detected. The system is expandable, allowing up to 45 sensors to be paired with one receiver, and it has a long range of up to 200 feet between sensors and receiver.