Honeywell DC917SL 200m 90dB MP3 light ring white wireless chime set

Series 9 Easy installation - no wiring required, wireless range of up to 200 m (measured in field conditions, walls, ceilings and metal structures reduce the maximum range), built-in repeater/radio amplifier increases the wireless range to up to 400 m (measured in field conditions, walls, ceilings and metal structures reduce the maximum range, additional wireless chime Series 9 is required), Honeywell ActivLink for reliable wireless range, digitally enhanced sound with volume control, maximum volume of 90 dB, listening range up to 100 m, selection of 8 melodies, sleep/mute mode, optical notification via HALO light ring with additional LED flash light, brackets included, up to 5 years battery life, optional power connection via micro USB