The Honeywell Home Series 9 Doorbell has a market-leading 5-year battery life, 100m audible range and 450ft (137m) wireless range. Take it with you to the basement, the backyard, or as far away from the sleeping baby as possible. And if the chime can’t be heard, Halo and LED light notifications will flash or give you peace and quiet with the Sleep and Mute modes. CUSTOMIZE YOUR ALERTS: Choose from 11 pre-installed tunes or use the included USB cord to download your own MP3 files. PORTABLE DESIGN: The Series 9 Doorbell has a wireless range of 450 feet that allows you to take the doorbell with you to the basement, backyard or as far away from the sleeping baby as possible. ADJUSTABLE VOLUME: The volume can be adjusted up to 90 decibels or muted with the option to set notifications to visual lighting alerts only. MUTE AND SLEEP MODES: Mute and Sleep modes silence notifications for 3, 6, 9 or 12 hours - or permanently - for adjustable use throughout the day. VISUAL ALERTS: The illuminated halo (7 color options) and LED strobe alerts can be set to light up when the doorbell is pressed. POWER: Requires 4 C-alkaline batteries that will last up to 5 years with typical use. PUSH BUTTON: Included with the doorbell is a white, surface-mount push button made of weather resistant plastic.