The Byron 771 is a reliable wired doorbell chime, designed for straightforward installation and dependable visitor alerts. This classic doorbell solution provides a clear 'ding-dong' sound, making it ideal for residential properties, small offices, or workshops requiring a traditional notification system. It features a simple 2-wire installation process and is hard-wired for consistent performance. With an 85dB sound pressure level and a preset volume, the chime ensures visitors are heard. It is compatible with all wired Byron doorbell ranges. Transformer and battery not supplied. Hard-Wired Chime Compatible with All Wired Byron Doorbell Range 1 Melody 2-Wire Installation Single Chime Supported Preset Volume 85db Sound Pressure Level Hard-Wired Chime Compatible with All Wired Byron Doorbell Range 1 Melody 2-Wire Installation Single Chime Supported Preset Volume 85db Sound Pressure Level