The Honeywell Home DC311N Wireless Doorbell Kit offers simple, reliable, and hassle-free operation, perfect for homes, apartments, and businesses. It features a remarkable wireless range of up to 150 meters and operates at a frequency of 868 MHz for enhanced reliability and superior connectivity. The doorbell comes pre-linked and ready to use out of the box, with options for screw-less installation and an easy-open battery compartment. It delivers a loud and clear ring with adjustable volume up to 80 decibels and offers four different melodies. A unique secret knock function plays a different tune when the button is pressed three times in succession, allowing you to distinguish between family and friends. The compact design and elegant white finish ensure it seamlessly integrates with any home décor. Additionally, you can connect alarm accessories to create a simple home alarm setup. Requires 4 x LR6 (AA) 1.5V batteries for the chime and 1 x CR2032 (3V) battery for the push button, with the latter included and offering up to 2 years of life.