【Waterproof Doorbell & 【Easy Installation】 - The doorbell is IP55 waterproof, with minimalist design and easy operation. The wireless installation is very simple: the button is attached to the outside wall and the doorbell receiver is plugged into the socket and is ready to use. 【Extremely Reliable Launch Distance】 - 1,300 feet range, reliable wireless signal without affecting your home electronics so you never miss your visitors or packages again, up to 3 years transmitter battery life for a premium user experience 【Various Ringtones & Adjustable Volume】 - 55 ringtones for different options, 5 levels of adjustable volume and clear melodies that can be heard even when you are in another room and several floors away. 【Loud Doorbell & Flashing LED】 - The 110 dB loud doorbell with flashing LED is designed for the hearing impaired and the elderly and can of course be set to 0 dB so as not to be disturbed 【Extendable & 【Support】 - If you want to expand the doorbell system to your home, you