The BS 5446-3 Vibrating Pillow Pad, part no. BF320, is designed to be placed flat under the pillow / mattress of a hearing impaired person to provide warning of a fire alarm condition. The BF320 plugs directly into a separately available BF320JP connector plate and is also compatible with commonly available third-party connector plates. It is a 10-30Vd.c. device that vibrates when triggered and also pulses on and off as per BS 5446-3.
C-Tech BF320JP Connection Plate