There are a number of great smoke detectors designed specifically for those with a hearing difficulty. Some alert you by sounding a loud, low-frequency alarm while vibrating the bed.
Other hearing loss aids are more than simple smoke detectors. Some can also alert to carbon monoxide detectors, weather radio emergency messages, burglar alarms, ringing phones, and chiming doorbells.
For other personal safety products that can enhance and protect the lives of those with hearing difficulties, contact your local audiologist.