WIRELESS DOORBELL KIT: Includes everything you need for DIY installation 1 outdoor remote doorbell transmitters and 1 plug-in smart doorbell receiver, double sided tape, anchors, screws.An A23 battery is included and will last for up to 3 years. Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered.Has 4 volume settings, perfect for naptime or parties. Our patented technology uses the highest quality microchips and does not need wifi or bluetooth.The signal from the wireless bell ranges up to 1000 feet.Great for large homes, apartments, offices, and warehouses.U.S. Pat. Not only have we made the traditional door bell ringer wireless, but we made it smart too.It will remember your customized settings and has sleek, modern LED lights that illuminate and blink for guests to easily spot at night. Our wireless door bell will work through snow, rain, or sunshine.The strong body of our battery doorbell is truly weather proof and will operate between temperatures of -4F to 140F while combatting the elements for years to come. Bulb Voltage :110 volts