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 sure that 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 places to avoid contact of both units form water and direct sunlight. 2. When the LED indicator does not go on, the battery power is either low or dead. At that 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 that 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, cool place. 7. The driveway alert is not a toy and should keep out of reach from children. USER-FRIENDLY: The door bell 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 mete