This clock is ideal for people who have dementia and for whom this has affected their ability to reason accurately the time of day - is it 10 oclock in the evening or morning The clock has graphics that turn with the hour hand displaying light blue, white clouds and mid day sun to help illustrate daytime and dark blue, stars and crescent moon at midnight for night-time. It also indicates with graphics morning, afternoon, evening and night-time. The hands are distinct from one an other. This avoids misinterpreting 12.20 for 4.00 as often happens. Requires 1 x AA battery (supplied).