1Wireless doorbell to remind you the coming of your guests by lovely songs 238 songs to choose, and it can be changed from a touch of a button 3Easy to use, just place the sensor at the entrance to your driveway and the receiver inside your home 4Great for house, office, hotel, shop, etc 5Alerts you when someone enters your driveway, walking path, doorway or business, such as visitors, vehicles, intruders, animals or kids coming or going Features:1. Wireless doorbell to remind you the coming of your guests by lovely songs. 2. 38 songs to choose, and it can be changed from a 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. Great for house, office, hotel, shop, etc. 5. Alerts you when someone enters your driveway, walking path, doorway or business, such as visitors, vehicles, intruders, animals or kids coming or going. Specifications: Condition: 100% brand new and high quality Material: Plastic shell Receiver Working Voltage: 110V-240V Transmitter working voltage: 4.5V 3x AAA batteries(not included) Working range: Up to 70 meters Infrared sensing distance: 3-7 meters Receiver button control: Music source: 38 different songs Volume adjustment: high, middle, low(60~105dB) Voice: Can set it with light and voice / with light and no voice Plug: US Plug, EU Plug (optional) (please note if it is fit for your country standard ) Pattern: 1 Transmitter & 2 Receiver, 1 Transmitter & 2 Receiver, 2 Transmitter & 1 Receiver, 2 Transmitter & 1 Receiver(optional) Transmitter: Approx. 80 * 59 * 45mm/3.15 * 2.32 * 1.77 inch Receiver: Approx. 76 * 80 * 33mm/2.99 * 3.15 * 1.30 inch Weight: Approx. 226-237gHow to Use: 1. Place the correct batteries in the detector. 2. Make sure that the batteries have been put in the proper positions. 3. Mount the detector properly by the front door, window frame , driveway, walk path , backyard or anywhere you need. 4. Then switch on the receiver and adjust the volume to either high or low position. 5. Now the remote detective system is operating with the infrared detect technology. 6. Place the receiver in an easy to reach place. 7. When the detector senses motion , the receiver will make an audible sound & the LED light will flash. 8. Please wait for 30 seconds after switching on detective & receiver to activate. 9. Please install both units 3 feet above ground level for optimal perfo