1. Wireless doorbell to remind you of the arrival of your guests with pretty songs2. 38 songs to choose from, and they can be changed at the touch of a button3. Easy to use, just place the sensor at the entrance to your driveway and the receiver inside your home4. Ideal for home, office, hotel, store, etc.5. Alerts you when someone enters your driveway, path, door, or business, such as visitors, vehicles, intruders, animals, or children arriving or going Specification: Features:1. Wireless doorbell to remind you of the arrival of your guests with lovely songs.2. 38 songs to choose from, and they can be changed at the touch of a button.3. Easy to use, just place the sensor at the entrance to your driveway and the receiver inside your home.4. Ideal for home, office, hotel, store, etc.5. Alerts you when someone enters your driveway, path, door or business, such as visitors, vehicles, intruders, animals or children coming or going.Features: status: brand new and high qualityMaterial: Plastic shellReceiver operating voltage: 110V-240VTransmitter working voltage: 4.5V 3 AAA batteries (not included)Working range: Up to 70 metersInfrared detection distance: 3-7 metersReceiver Button Control:Music Source: 38 different songsVolume control: high, medium, low (60~105 dB)Voices: Can adjust it with light and voice/with light and without voicePlug: US plug, EU plug (optional) (please note whether it is suitable for your country standard) Pattern: 1 transmitter and 2 receivers, 1 transmitter and 2 receivers,2 transmitters and 1 receiver, 2 transmitters and 1 receiver (optional)Transmitter: approx. 80*59*45mm/3.15*2.32*1.77inchReceiver: Approx. 76 * 80 * 33 mm / 2.99 * 3.15 * 1.30 inchWeight: approx. 226-237gHow to use:1. Place the correct batteries in the detector.2. Make sure the batteries have been placed in the correct positions.3. Mount the detector properly near the front door, window frame, driveway, walkway, backyard or anywhere you need it.4. Then turn on the receiver and set the volume to high or low.5. Now the remote sensing system works with infrared sensing technology.6. Place the receiver in an easily accessible location.7. When the detector detects movement, the receiver emits an audible sound and the LED light flashes.8. Please wait 30 seconds after turning on the detective and the receiver to activate it.9. Please install both units 3 feet above ground level for optimum performance. How to Care and Maintain: 1. Please keep the detector and receiver in sheltered places to avoid contact of the two units underwater and direct sunlight.2. When the LED indicator does not light up, the battery power is low or dead. At that time, you need to change the batteries.3. Regularly clean the detective with a damp cloth to prevent the sensor from being blocked by dirt or small particles.4. Try to keep it in places where it won't get wet. Also, during heavy storms and snowfall, it is recommended that the unit be moved indoors or to a safe location.5. Never attempt to disassemble the units.6. When the device is not in use, remove all batteries; clean both units and store in a cool, dry place.7. The device is not a toy and should be kept out of the reach of children.Package included:1 transmitter2 receivers2 screws2 tubes extension.2 accessories Note: The data is manual measurement, please allow 1-17cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.