Sonic Alert "The Skull Alarm Clock with Bone Crusher Bed Shaker (SBS550bc) MP3 player input lets you wake up to your own music Wake up to a loud pulsating audio alarm, a shaking bed, or both Adjust the alarm volume and tone to achieve the most effective audio alert Includes orange flashing lights, snooze, dimmer, and battery backup Alarm Volume: Adjustable, up to 113dB