Long-range motion sensor detector alarm with wireless link up to 328 feet (100 meters) between transmitter and receiver. Place the receiver at a distance from doors or entryways to alert you to arrivals and departures of family members, unwanted guests, solicitors, or anyone visiting your home or business. - Two alert modes and 38 ringtones: door bell chime offers LED flash with sound or LED flash only; three volume levels (High/Middle/Low) from 25 to 80 dB; choose from 38 ringtones. - PIR sensor: uses state-of-the-art passive infrared (PIR) to detect movement within the detection range. The sensor runs on 3 AAA batteries (not included) and sends a signal to the receiver when motion is detected. - Easy to install: set up in minutes. The sensors can be mounted to walls, fence posts, trees, or any other surface, providing an extra layer of security for home or business. Use scenarios: - At the front door or driveway to know when family members return, guests arrive, or deliveries approach. - On fences or building entrances to monitor activity around a property, shop, or small business. - In a backyard or loading area to receive timely alerts after hours.