[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 prepvious button to easily choose from 55 melody; 5-level tonal volume, maximum volume is 100 dB; whenever someone knock Enjoy a pleasant melody when you do the do [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 applicable 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 make 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 so