About this product: Reliable distance range: Communication range up to 300m/ 1000ft (distance between sensors and receiver/alarm/chime) and detection range up to 8m (distance between sensors and detected objects). Adjustable volume and mode: The alarm volume is up to 100dB with 3 alert choices (high volume chime/low chime/alarm) and 3 mode choices (flashing/LED/sound and LED flash). Different applications: Perfect for keeping you informed with a little warning before guests or intruders arrive. You can expand the alarm system for your home with up to 5 sensors or 5 receivers for your demand. Installation Tips: Keep the PIR sensors in a clear path to the receiver and do not place the sensors where the wind will move them or change their detection angles, so that you can achieve optimal performance. Power Supply: You can use 3 Poles 1.5V Type C (not included) or AC adapter (not included) for the receiver, and 3 Poles AAA (not included) for the sensors. Never use Type C Poles and AC