The battery is supposed to last 5 years due to no calendar and no second hand;  It's easier to read the time with no second hand.  In bright indoor light or outdoor sunlight, it has a jewel-like shimmering blue/black appearance.  In dimmer indoor light, the face looks mainly black.  This is probably the thinnest watch made among all watch makers--you hardly know you're wearing it.  Band contours to your wrist and is very comfortable.  Previously I owned the all black model similar to this for 4 years.  It still has the original battery and always kept good time.  The crystal cracked when it fell off my wrist due to worn/bent clasp pin.  I should have replaced the bent pin sooner.  I liked it so much I bought this similar model.  At $76, it is a great watch.