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 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 Pattern: 1 Transmitter & 2 Receiver, 1 Transmitter & 2 Receiver, 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. 226-237g How 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 performance. How to care and maintain: 1. Please keep the detector & receiver 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 detective 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 device is not a toy and should keep out of reach from children. Package Included: 1 x Transmitter 2 x Receiver 2 x Screws 2 x Expansion Tube 2 x Accessories .