This Telephone Ring Indicator and Flasher will sense an incoming call and will boost the existing telephone ring by up to 95dB, thereby helping to ensure that people with restricted hearing will not miss a caller.As an added extra, it also has a flashing light as a visual cue that someone is ringing. The ring volume and tone can both be adjusted to suit the hearing of the user.The system is also compatible with the CLA2 shaker pad, which is sold separately. Used together, the units will cause the shaker pad to vibrate, thus helping to ensure that the user is made aware of the call even if he or she is asleep. For those who live in large properties, a second Ring Indicator can be used to boost the range of the system, which is normally 25 metres indoors.