Reliable Distance: Communication range up to 300m (distance between sensors and receiver). Detection up to 8m (distance between sensors and detected objects). Adjustable Volume and Mode: Alarm volume up to 100dB with 3 alert choices (high volume/carillon chime/alarm) and 3 mode choices (flashing/LED/sound and LED flash). Various Applications: Perfect for staying informed with a little warning before or intruders. You can expand the alarm system for your home with up to 5 sensors or 5 receivers for your request. Installation Advice: Keep the PIR sensors in a clear path to the receiver and do not place the sensors where the wind will move or change their detection angles, so you can get optimal performance. Power: You can use 3 1.5V type C batteries (not included) or AC adapter (not included) for the receiver, and 3 AAA batteries (not included) for sensors. Never use type C and adapter batteries at the same time. Product Description Size: 1 Receiver with 2 Motion Detectors Security Alarm for Walkway. The alarm for the walkway offers a practical and economical way to alert you when someone is training. When an object is detected, the PIR sensor sends a signal to the receiver up to 300 meters away and you will be informed and protected. Features: Operating distance: 300 m (outdoors without obstacles). Motion detection range: 5-8 m. Volume: ≥ 100 dB (within 5 m). PIR detection angle: 45 degrees. Protection class (PIR sensor): IP44. Power supply (receiver): 3 poles of type C 1.5 V / DC 6 V adapter (not included). Power supply (PIR sensor): 3 AAA poles (not included). Note: Do not climb the PIR sensor in direct sunlight (PIR detects moving heat sources) or in a place affected by the wind. Avoid mounting the PIR sensor and receiver near any metal object. When installing the sensor outdoors, a shady and protected place to minimize temperature changes. The receiver's ringtone may be affected by metal structures, walls and other devices with the same frequency. Contents: 1 receiver. 2 Pir sensors. 1 1 manual (not guaranteed French). Vis.