This totally portable chime has an extra loud
chime for the hard of hearing with a flashing strobe light option
to alert you to the door. It has a choice of chime sequence and
tones to suit individual needs. There are two alternative sound
levels (up to 87dB) as well as a mute setting if you wish to be
alerted by the light only (e.g. if the baby is sleeping). It has
a 200m range in open air; up to 120m indoors.