Wireless Doorbell, USB and Battery Waterproof Door Bells Operating up to 700ft, Portable Doorbell Chime with 39 Melodies and 4 Volume for Home, White(1 Receiver & 1 Push Button) : Amazon.ca: Tools
Wireless Doorbell, USB and Battery Operated Door Bells IP55 Waterproof 700 Foot Long Range with 4 Volume Levels 39 Chimes Indicator Light Doorbells Easy Install for Home (2 Receivers+1 Sensors) - Amazon.com
Silvercrest Premium Wireless Doorbell | bol
User manual SilverCrest HG01041A (English - 107 pages)