Wake to any combination of loud pulsating audio alarm, flashing light or shaking bed. The audible alarm has adjustable volume and tone control to set for the most effective alarm. There is an AC outlet in the back to plug in a bedside light to flash when the alarm goes off (The lamp is controlled with a large yellow button on the clock for bedside use.). A pillow vibrator can also be plugged in for alarm. Time is displayed in large bright green LED numbers. For additional versatility, the Sonic Boom™ can be used as a receiver with other Sonic Alert signalers. Five year warranty.