【55 Melodies and 5 Level Volume】High quality wireless outdoor doorbell, with the most stable music chip, built-in 55 melodies, produces clear and pure sound. Four volume levels adjustable from 0 dB to 110 dB. When the bell rings, you can easily hear it in the house. A memory function is available for tone and bell selection. 【Waterproof and Smart LED Design】The waterproof wireless outdoor doorbell made of high quality material is waterproof to IP55 standard, ensuring stable performance for outdoor use. The blue LED on the button and receiver is a visual indicator for hosts and visitors, and a fun and careful design for the hearing impaired. Visitors will know if they have used the correct doorbell as it will light up when used. 【Easy Installation】Just plug the outdoor doorbell receiver into an electrical outlet and install the push button with double-sided tape and screws included. A jig for drilling the screw positions is included if you want to drill holes for mounting the push