【Waterproof Doorbell & Easy Installation】 - The doorbell is waterproof according to the IP55 standard, with a minimalist design and easy operation. It is very easy to install wirelessly; the button is attached to the outer wall and the doorbell receiver is plugged into the socket and is ready to use. 【Ultra-Reliable Range】- 400 meters of reliable wireless signal coverage without interfering with your home electronics, ensuring you never miss visitors or packages again. Up to 3 years of battery life for the transmitter for a superior user experience. 【Various Ringtones & Adjustable Volume】- 55 ringtones for different options, 5 adjustable volume levels and clear melodies that can be heard even if you are in another room or several floors away. 【Loud Doorbell & Flashing LED】- The loud 110dB doorbell with flashing LED is designed for the hearing impaired and elderly, and can of course be set to 0dB so as not to be disturbed. 【Expandable & Supported】- If you want to expand the doorbell system throughout your home, you can add a receiver and transmitter of the same model. With a 24-month warranty, you don't have to worry about anything. You have two installation methods to choose from: 1. Attach the button to the wall or door frame with the included double-sided tape. 2. Attach it with the screws (included), but you will need a small electric drill to make holes in the wall. Note: Do not mount the doorbell on a metal surface, as this will reduce its wireless range. DOOR PLATE: The extra doorbell plate provides a better signal for your visitor or delivery person. Silent mode: You can turn off the doorbell if you don't want to be disturbed. Flashing Blue LED: When someone rings the doorbell, the receiver's blue LED flashes as a visual signal specially designed for the hearing impaired. Memory function: The latest volume and sound settings are not lost when the device is turned off or reconnected. 55 Ringtones and 5 Adjustable Volume Levels (0-110dB): The standard ringtone on the plug-and-play doorbell is \"Ding Dong\", and there are 55 different ringtones with classic melodies, animal sounds and party songs for various festive occasions. You can choose a unique melody and it is very easy to set up. With a maximum volume of 110 dB, you can hear it even from several floors. Dust and water resistant (IP55). The weatherproof outdoor doorbell button is suitable for various climates in DE and works in temperatures from -30℃ to 70℃. The transmitter is powered by a 12V23A battery with a lifespan of up to 3 years, so you don't have to change the battery often.