Sonic Alert Bed Vibrator 120V -Vibrator Only - Place this alert bed vibrator between your mattress and box spring or under your pillow and plug it into a Sonic Alert alarm clock or remote receiver (neither included). The lightweight and portable unit bed vibrator alert system responds to a wake-up alarm, doorbell, telephone or a baby's cry. This bed vibrator alert system uses standard AC power and comes with a 5-year warranty.