Although the instructions are in tormented English (and Chinese), a few minutes of experimenting were all that was necessary to reveal what each of the four buttons did. It sets pretty much the same way as most other electronic gadgets.  And I got the Black color I bought, despite a picture of a blue version that incorrectly shows up on the purchase record. Anyway, the numbers are all nice and bright in the dark, with a somewhat lighter brightness for the face itself.  It looks very manly because of the size, but actually feels nice and light on the wrist. For the price it's a very good deal.