Infrared Sensor Split Wireless Doorbell Specification: Brand new Receiver size (approx.): 76*80*33mm PIR sensor size (approx.): 80*59*45mm Weight (approx.): 0.17kg Operating range: Up to 70 meters Infrared sensing distance: 3-7 meters Receiver operating voltage: 110V-240V PIR sensor operating voltage: 4.5V (3 AAA batteries) Tips: Avoid placing the detector in windy areas. Ensure a clear path between the detector and receiver for optimal performance. Care and Maintenance: 1. Important: Protect the detector and receiver from water and direct sunlight. 2. If the LED indicator doesn't light up, the power is low. Replace the batteries. 3. Clean the detector regularly with a damp cloth to prevent dirt or particles from blocking the sensor. 4. Store in a dry place. During severe storms and snowfall, move the unit indoors or to a safe location. 5. Never disassemble the units. 6. When not in use, remove all batteries, clean both units, and store in a dry, cool place.