Replacement vibrator for old black model sonic boom alarm clock.Place this bed vibrator between mattress and box springs or under pillow and plug it into either Sonic Alert's wake-up alarm Lightweight and portable, unit responds to wake-up alarm, doorbell, telephone or baby's cry.BRD/C AUXILIARY JACK. Mfg Warranty: 5 Years Can only be used with old black model sonic boom alarm clock. Size-3 1/2 diameter.
