Series easy installation, no wiring required, wireless range of up to 200 meters measured under field conditions. Walls, ceilings, and metal structures reduce the maximum range. The built-in repeater wireless amplifier extends the wireless range to up to 400 meters measured under field conditions, with walls, ceilings, and metal structures reducing the maximum range. An additional wireless chime from the series is required. Honeywell-ActivLink ensures reliable wireless range. Digitally enhanced sound with volume control, maximum volume of 90 dB, hearing range of up to 100 m. Selection of melodies, sleep mute mode, optical notification via HALO light ring with additional LED flash light. Includes mounts, up to 2 years battery life, optional power connection via Micro-USB. Set includes: wireless chime and extension transmitter including CR2032 battery for the extension transmitter, wireless extension for an existing doorbell or intercom system Honeywell Home DC915SCV.