4 Pack Vacuum Cleaner HEPA Filters for Cyclonic Series RO3753EA RO3731EA RO3786EA Portable Vibrating Alarm Clock:this wireless bed shaker alarm clock takes no risk of connection loose like other wired vibration alarm clock, you can carry the portable alarm clocck to anywhere you want, put it on nightstand, bed and mattress, under the pillow or your quilt.<br> 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.<br> Advantages of a vibrating alarm clock:The vibrating alarm clock is reminded by vibration. Before going to bed, place a vibrating alarm clock under your pillow. When vibrating, it generally does not disturb others, and the effect is better than a sound alarm clock, which does not cause noise.<br> Disadvantages of a sound alarm clock:The alarm will affect short-term memory if it wakes up.The loud sound of the alarm clock may cause high blood pressure.Repeated wake-up by the alarm clock can exacerbate physical fatigue.<br> Power supply method:Three No. 5 batteries are used for power supply (when the battery is used for power supply, the product cannot stay on, simply press the "SNZ" button to turn on the backlight). Note: The product does not include batteries when shipped.