Waterproof & Easy Installation- The doorbell is waterproof to IP55 standard, with minimalist design and simple operation. It is very easy to install wirelessly, the button is fixed to the outside wall and the doorbell receiver is plugged into the socket and ready to use Ultra-reliable launch distance- 1,300FT coverage reliable wireless signal without interfering with your home electronics, ensuring you never miss your visitors or packages again, up to 3 years of transmitter battery life to ensure a superior user experience Various Ringtones and Adjustable Volume- 55 ringtones for different options, 5 levels of adjustable volume and clear melodies that can be heard even if you are in another room and several floors away Loud Doorbell & Flashing LED- The 110dB loud doorbell with flashing LED is designed for the hearing impaired and the elderly, and of course can be set to 0dB so as not to be disturbed Expandable & Bracket- If you want to extend the doorbell system to your home, you can add a receiver and a transmitter of the same model. Support 24 months warranty, you don't have to worry about anything There are two installation methods for you to choose 1. Attach the knob to the wall or door frame using the supplied double-sided tape. 2. Fix it with screws (supplied), but this requires a small electric drill to drill holes in the wall. Note: Do not fix the doorbell to a surface metal, as this will reduce its wireless distance. DOOR PLATE: The additional doorbell plate provides a better signal for your visitor or delivery person. 0 mute You can mute if you don't want to be disturbed. Flashing blue LED When someone rings the doorbell, the blue LED on the receiver flashes like a visual signal specially designed for the hearing impaired. Memory function The last volume and sound set are not lost when the device is switched off or reconnected. 55 ringtones and 5 adjustable volume levels (0-110dB). The default ringtone of the plug-and-play doorbell is Ding Dong, and there are 55 different ringtones with classic melodies , animal sounds and party songs for different festive occasions. You can choose a unique melody and it's very easy to set up. With a maximum volume of 110 dB, you can hear it even if you are on several floors. Dustproof and waterproof (IP55) The outdoor waterproof doorbell button adapts to different DE climates and operates in temperatures ranging from -30 to 70. The transmitter is powered by 1 x 12V23A battery which has a maximum lifespan of 3 years, so you won't need to change the battery often.