Size:18.5inch Arge and wide, the clock has a beautiful, bright display. The calendar in the lower part is showing day of the day of the week and the date. If you have an aging parent, especially one with low vision or who has a memory issue, they will find this product very useful. All the information they need, displayed clearly to them with big letters. They will be thank you for this gift. Key Product features: A black frame completes a very contemporary look, Black case fits any home or office décor. The Calendar Clock can stand upright on a table or be hung on the wall. The AC adapter (included) plugs into a recessed outlet on the back so the clock will still hang straight. This clock has a memory chip and will not need to be reset if it loses power. Clock accuracy: less than or equal to plus or minus 0.3 seconds / day Power: 110V-240V, 50Hz/60Hz plus or minus 15% Power: less than or equal to 2.5W Material:Plastic + glass Pattern:digit Time display:24hrs Power type :external power supply Adapter:EU,US Calendar features: Big characters for the calendar, it's easy to read without having to convert numbers to day and month, this calendar keeps you on track, without converting numbers to dates! How to switch 12/24 hours:On the back of the clock, press and hold the second button ("UP") for at least 6 seconds, and the clock will automatically switch to the 12-hour clock. "UP" Press and hold for a few seconds, you can automatically switch between 12/24 hours.