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. EASY TO INSTALL & SETUP: Our portable doorbell easily pairs and connects so you can make your wireless doorbell battery powered. Customize it by simply selecting from more than 50 doorbell chime sounds. Has 4 volume settings, perfect for naptime or parties. LONG RANGE: 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. SMART TECH: 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. Truly reliable and weather proof, will operate between temperatures of -4F to 140F. VERSATILITY: Our wireless doorbells work great for any occasion - apartment homes, townhomes, small businesses, warehouses, offices and condo properties can benefit. Whether you're using it outdoors for your front gates, back fences, or mailboxes or indoors for teachers seeking helpful classroom organization and management.