Product Description Offers two operating modes: LED flashing only or sound + LED flashing. Three volume levels: high, medium, and low. 38 ringtones available. The receiver has an effective operating range of up to 70 meters. The PIR human body sensor has a range of 3-7 meters. Suitable for homes, offices, shops, hotels, or other buildings. Ideal for alerting businesses working behind or outside their line of sight when customers enter. Can also be used as a signal for animals entering or leaving. Applications: Entry alarms, intrusion alarms, passageway alarms, eavesdropping detectors, car alarms (indoor), warehouse security monitoring, power cabinet alarms, garage and tool shed monitoring, mailbox sensors, front door or aisle detection. Package Contents: Plug-in electronic receiver, PIR human body sensor (requires 3 AAA batteries, not included). Installation Steps: 1. Insert the correct batteries (3 AAA batteries) into the sensor and ensure the batteries are installed correctly. 2. Install the sensor correctly near the front door, window frame, driveway, sidewalk, backyard, or anywhere else you need it. 3. Turn on the receiver and adjust the volume to a suitable level. 4. The remote sensing system is now operational using infrared sensing technology. 5. Place the receiver in an easily accessible location. 6. When the sensor detects movement, the receiver will emit a sound, and the LED indicator will flash. 7. After turning on the sensor and receiver, please wait 30 seconds for activation to complete.