【Waterproof Doorbell & Easy Installation】 - The doorbell is IP55 waterproof, with a minimalist design and simple operation. It is very easy to install wirelessly, the button is fixed to the outdoor wall and the doorbell receiver is plugged into the socket and ready to use. be used 【Ultra-Reliable Launch Distance】- 1,300FT reliable wireless signal coverage 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 & 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 away. 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 & Support】- If you want to expand the doorbell system