[300M Wireless Range]: Two plug-in receivers; other devices that do not interfere with your home or neighbors; make sure you don't miss any visitors, even if you are in several rooms. [55 Beautiful Bells]: stereo speakers offer rich and crisp sound; pressing the next or previous button to easily choose from 55 melody; 5-level tonal volume, maximum volume is 100 dB; whenever someone knocks Enjoy a pleasant melody when you do the door. [Waterproof Design]: The doorbell button has the high waterproof level of IP55 to ensure perfect use in rainy days. The working temperature is between -30 ° C to 70 ° C to ensure that it applies to different regions of different climates. [LED Indicator]: When pressing the doorbell transmitter, a LED light will be issued on the receiver, which facilitates people's voice and makes sure you always receive alert, especially in silent mode. [Easy to Install]: It is basically no need to install. No wires need to wire. No drilling. The ringer / receiver is inserted into the wall outlet, so it will never be exhausted. 2 options, either with screws, either with your own viscose. Includes some mini screwdrivers to help you install the switch outside the door. The adhesive remains good when it is raining or snowing.