EASY INSTALLATION: As for this visitor chime, there are no wires to run, no installation hassles, the sensor is wall mountable. Place the correct batteries (3 AAA batteries)(not included), in the Sensor, make the batteries have been put in the proper positions. Mount the Sensor properly by the front door, window frame, driveway, walk path, backyard or anywhere you need. Switch on the receiver and adjust the volume to the right position. Now the remote detective system is operating with the infrared detect technology. Place the Receiver in a place easy to reach. When the Sensor detects motion, the Receiver will make an audible sound & the LED light will flash. Please wait for 30 seconds after switching on Sensor & Receiver to activate. Receiver Switch Setting: 1)Music source: 38 different musics for optional, use the external button "music" to finish. 2)The function of volume adjustment: there are three kinds of volume (high, middle, low) for choice. 3)Adjust sound and silence Legal Disclaimer: 1. Important: please keep the Sensor & Receiver of the arrival/departure chime in sheltered to avoid contact of both units form water and direct sunlight. 2. When the LED indicator does not go on, the battery is either low or dead. At time you should change the batteries. 3. Clean the Sensor regularly with a damp cloth to avoid blockage of sensor by dirt or any small particles. 4. Try to keep it in areas where it will not get wet. In addition, during heavy storms & snowfalls, it is recommended unit should be moved indoor or in a safe place. 5. Never attempt take apart the units. 6. When the unit is not in use, take out all batteries; clean both units and store the units in dry, place. 7. The driveway alert is not a toy and should keep out of reach from children. USER-FRIENDLY: The door chime have 2 modes choices (LED Flash/Sound and LED Flash) EFFECTIVE DISTANCE: Working range is up to 70 meters. Infrared sensing distance is 3-7 meters. It can be successfully used for your home, office, shop, hotel or other buildings. PIR TECHNOLOGY: Our sensor uses state-of-the-art passive-infrared (PIR) sensor to detect any movement within the detection range. Perfect for long or driveways and allows you a fore warning when guests (or intruders) are approaching. Material: ABS color: white Working Voltage of the Receiver: 110V-240V Working Voltage of the PIR Sensor: 4.5V(3 AAA batteries)(not included) Receiver size: 76*80*33mm PIR Sensor size: 80*59*45mm Weight: 0.16kg To avoid alarms 1. Mount the Sensor from direct sunlight, such as under an overhang, covered area, or in a non-metal box. 2. Do not place the Sensor in areas where the wind will move it, also try to keep the Sensor in a clear path to the Receiver, so you can get optimal performance. 3. It might be helpful (if you haven't tried yet) to move and mount the Sensor in a higher position, then angle the Sensor to face the driveway. This may hopefully reduce the interference from objects in the distance and from sunlight. 4. Lastly, if none of these suggestions help, try tapping over a little of the sensor area with black tape as this may reduce Sensor sensitivity. Plug Type: EU Plug, it applies to Indonesia, Germany, , Spain, and so on. Package Contents: 1* plug-in receiver 1* infrared detector Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.