Features: Accessibility Penetration: Strong penetration performance receiving distance from the open space straight line distance can reach 300 meters do not worry about signal problems. Anti-interference Not Crosstalk: Digital circuit design multiple sets of use is not crosstalk effectively avoiding mutual interference between neighbors to bring trouble. Easy to Install: The receiver is installed indoors the transmitter is installed outside the door plugged in press the button indoor ringing save time and convenience plug and play. Other Advantages: 60 music 5 levels of volume humanized design music at your choice adjustable volume. Waterproof Design: The transmitter is waterproof in line with IP44 waterproof standard can prevent rainwater intrusion effectively extending the service life of the product. Specifications: Power Supply Mode: AC Power Supply Voltage: 110-220 (V) Ringing Tone: 60 music 5 volume adjustable to mute Power Consumption: 1 (W) Application Range: Open space straight line distance of 300 meters data from the factory laboratory Type: Wireless doorbell Note: the actual reception signal depends on the environment due to different obstacles signal are different. (Data provided by the factory laboratory test) includes: 1 * Set of Doorbell "