Portable Vibrating Alarm Clock: This wireless bed shaker alarm clock has no risk of disconnection like other wired vibrating alarm clocks, you can carry the portable alarm clock anywhere you want, put it on the bedside table, bed and mattress, under the pillow or your duvet.Functions: Vibration and noise: adjustable intensity at three levels; Two sets of alarm clocks; Time (press the "SNZ" button to turn on the backlight, and there is no operation to turn off the backlight within 10 seconds); Decorative night lighting .Advantages of a vibrating alarm clock: The vibrating alarm clock is reminded by vibrations. Before going to bed, place a vibrating alarm clock under your pillow. When it vibrates, it generally does not disturb others, and the effect is better than a sound alarm clock, which does not cause noise.Disadvantages of a sound alarm clock: The alarm affects the short-term memory if it wakes up. The loud sound of the alarm clock can cause high blood pressure. Repeated waking by the alarm clock can aggravate 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 when delivered.