Sonic Alert offers Vibrating Alarm Clocks that are designed specifically for the hard to wake, hearing impaired and the deaf. It's famous for its trade mark Bed Shaker, Sonic Bomb, Sonic Boom and Sonic Shaker. They are made from high quality materials and come with an One Year Guarantee. The vibrator connects to the alarm clock with a 6 or 15 ft. cord, and is placed under the mattress or pillow. The vibrator activates when the alarm on the clock goes off.There are many sound replacing accessories to alert hearing impaired people to baby crying, doorbell, telephone, video phone and other sounds. These items work with the built in receiver contained in the Sonic Alert SB1000SS Alarm Clock.