After-sales Guarantee - Zgrmbo promise to provide you with 18 months warranty, and 45 days return policy. Please buy with confidence! Any questions please feel free to contact us at . Great Gift for People with Vision Problems - The Zgrmbo F500 Digital Wall Clock's digits are bright and phantom-free even when viewing the time from any angle, and the large, clear 4-inch digits will help the visually impaired read the time more easily. Simple & Practical Little Functions - Press "+/-" button to switch standard/military time format. Long press "+" button to turn on/off the clock center 2 dots blinking. Long press "-" button to turn on/off the time and date display alternately. Zgrmbo F500 digital wall clock also has a hidden cable winder bracket, so you don't have to worry about cluttering up your wall or bedside with redundant cables when you hang it on the wall or put it on the bedside. Auto Dimming Mode - Press and hold the "LIGHT" button to set the auto-dimming mode, Zgrmbo F500 digital wall clock will display at 100% brightness from 07:00-19:00; and 60% brightness from 19:00-23:00; and 25% brightness from 23:00-07:00. You will no longer spend time adjusting the clock at night because it is too bright. PURCHASE NOTE - You will get 1 x F500 Digital Wall Clock, 1 x CR2302 Battery, 1 x USB Power Cable, 1 x User Manual. The CR2302 batteries will not power the clock but will hold the setting to avoid resetting the clock when unplugged or when power is lost in your home. USB ports on laptops, computers, and even a power bank can power this electric digital clock, or you can have a USB adapter(self-supply) for it. Accurate Digital Clock - Zgrmbo F500 Digital Wall Clock is an extremely accurate electric-powered digital clock that has been continually recognized by users for its precision over the past 2 years. Super Easy to Read - Zgrmbo F500 Digital Wall Clock (10.25"(L)*5.25"(W)) has 4 inches of huge, clear, and bright numbers, making it an easy-to-read time digital clock even from 20 feet away. Suitable for living room, classroom, garage, shop, gym, bedroom, etc.