Portable Vibrating Alarm Clock: This wireless bedside shaker alarm clock eliminates the risk of loose connections like other wired vibrating alarm clocks. You can place this portable alarm clock anywhere – on your nightstand, bed, mattress, under your pillow, or in your blanket. Features: Vibration and Buzz: Adjustable intensity on three levels; Two alarm clock settings; Time (press the "SNZ" button to turn on the backlight; there is no operation to turn off the backlight within 10 seconds); Decorative night light. Benefits of a Vibrating Alarm Clock: The vibrating alarm clock reminds you with vibrations. Before going to bed, place a vibrating alarm clock under your pillow. When it vibrates, it generally doesn't disturb others, and the effect is better than a sound alarm clock, avoiding noise. Drawbacks of a Sound Alarm Clock: The alarm affects short-term memory upon waking. The loud sound of the alarm clock can cause high blood pressure. Repeated waking by the alarm clock can worsen physical fatigue. Power: Three No. 5 batteries are used for power (when the battery is used for power, the product cannot be on; just press the "SNZ" button to turn on the backlight). Note: The product does not include batteries upon delivery.