Advantages of vibrating alarm clocks: A vibrating alarm clock is used to remind people by vibrating. Before going to bed, place a vibrating alarm clock under your pillow. When vibrating, it generally does not disturb others, and the effect is a sound alarm clock, which does not cause noise. Power supply: 3 x AA batteries (not included) Material: plastic colour: white Package Contents: 1 x alarm clock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Advantages of vibrating alarm clocks: A vibrating alarm clock is used to remind people by vibrating. Before going to bed, place a vibrating alarm clock under your pillow. When vibrating, it generally does not disturb others, and the effect is a sound alarm clock, which does not cause noise. Advantages of vibrating alarm clocks: A vibrating alarm clock is used to remind people by vibrating. Before going to bed, place a vibrating alarm clock under your pillow. When vibrating, it generally does not disturb others, and the effect is a sound alarm clock, which does not cause noise.