Working range and placement Up to 328 feet (100 meters) between the infrared sensor and the receiver, enabling you to place the sensor away from the receiver to monitor arrivals and departures of family members, unwanted guests or solicitors, or anyone who visits your home or business. Alarm tones, volume, and modes 38 distinct ring tones to greet your guests. Three levels of volume control: loud, medium, quiet. Two alarm modes: 1) ringtones with LED lighting, 2) LED lighting only. Sensor coverage Sensor range is 3 to 7 meters vertically and 3 to 5 meters horizontally. Power and compatibility Sensor power options: 3x AAA batteries or a 5V USB power supply (not included). Receiver power options: DC 110V–240V or a 5V USB power supply. Use scenarios Residential front door or driveway monitoring: place the sensor away from the living area to alert you to family arrivals, visitors, or solicitors, with audible tones and optional LED lighting. Small business reception or storefront: position the sensor at entry points to announce visitors to staff, with multiple ring tones and adjustable volume for clear notifications. Multiroom or yard monitoring: use the LED lighting option alone to discreetly indicate arrivals in areas where audible alerts are impractical. This device delivers a longrange wireless alert system with flexible power options, a wide choice of ring tones, and adjustable alerts to suit home or small business environments.