Reliable Range - Range of up to 100M (the distance from the sensor to the receiver) and Detection range of the sensor ( PIR sensing distance) is approximately 5-8M. It will keep you informed and safe by alerting you.<br />User-Friendly Features - Ring volume up to 100db; 3 Mode Choices (only LED Flash/Sound and LED Flash/ only Sound) ; 3 Alert Choices (High Volume Chime/ Low Volume Chime / Alarm).<br />Dependable Application - It uses a state of the art passive-infrared (PIR) sensor to detect any movement within the detection zone. Perfect for long or hidden driveways・ or to allow you just a little extra warning before guests (or intruders) arrive. .