The Amplicom Ringflash 250 is an amplified alerting system, it has a bright flashing light and loud ringer – ideal for users with hearing loss or in noisy environments. The ring volume is adjustable and several melodies are available. The telephone ringer and the acoustic sensor sound different so that you can differentiate between them and each have three tones to choose from. The Ringflash 250 comes complete with a wireless acoustic transmitter that can be attached to any device that makes a sound.Signal amplifier for telephones, door bells and alarms providing a bright flashing light, loud acoustic alarm and wireless door bell acoustic activation unit. Particularly well adapted to loud environments and people with hearing problems. Individually adjustable volume and melodies.Other features include Two different door bell tones available for selection, Connection port for PTV 100 shaker, Includes connection cable and compact power adapter, With wireless door bell acoustic activation unit (RFD01) and Second optional wireless activation unit (RFS01) for smoke or gas detector, retrofittable (not included).