DESC: This Sonic Boom alarm clock is a unique clock that is guaranteed to wake up even the heaviest sleepers. The white color allows for easier reading of the clock functions. The SA-SB1000 has an automatic dimmer that dims the brightness of the display when the room gets darker. When the alarm goes off, you can select to wake up to any combination of loud pulsating audio alarm, flashing lights, or shaking bed (optional vibrator is sold separately). The vibrator can produce a steady or pulsating vibration pattern for maximum effectiveness.