Door Bells & Alerters - for deaf people, hard of hearing impaired
Residential
Silent Alert SignWave receiver for deaf & hard of hearing people
Actually Clean - For the hearing impaired, install smoke alarms and alert devices made specifically for people who are deaf or hard of hearing. These units detect the sound of smoke alarms
Loud Alarms, Doorbells & Alerts | Hearing Products - CfD Shop @ Sarabec (Centre for deaf and hard of hearing people)
Fireco Deafgard Wire Free Vibrating Pillow Alarm - DEAF-G | The Safety Centre, UK
Mesqool Loud Alarm Clock with Bed Shaker for Deaf, Heavy Sleepers, Hearing Impaired,Dual Alarm,USB Phone Charger,Large LED Display,Big Snooze Button,DST 12/24H,Battery Backup, Adjustable Dimmer(White): Amazon.co.uk: Home & Kitchen