Ideal alarm clocks for the hearing impaired. But these alarm clocks are also perfect if you are not hearing-impaired, but are quickly sleeping through a normal alarm clock. Handy alarm clocks with vibration alarm and flash lamp. The alarm clock vibrates (can be switched off) and the alarm is loud: 75dB - 90dB. With a cushion clip or a separate vibrating plate for use in bed to place under the cushion.