This Extra Loud Doorbell with Flashing Strobe Light is designed for use by people with impaired hearing.When someone activates the doorbell, it will produce a chime of up to 88db, although the precise volume can be controlled by the user. It operates wirelessly, so no electrical installation work is required, and its maximum range is 150 metres (about 500 feet). As a further alert, the system also features a flashing strobe that activates in conjunction with the chime. The Extra Loud Doorbell with Flashing Strobe Light can be free standing, wall mounted or portable.