Nrs Healthcare Premium Extra Loud Doorbell With Flashing Strobe Light 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.Specifications:Doorbell uses one CR2032 battery (included)Chime uses two C batteries (not included)Sound output of 88db with volume controlUp to 150 metre range Features: Flashing ultra-bright LED alert when door chime sounds Free standing, wall mounted or portable Water resistant bell push Sound output of 88db with volume control Choice of 8 selectable ch