These are becoming more popular with divers, mainly because they may offer a cheaper alternative to the more traditional analogue. While digital watches often have various modes, it is most important that the time display is large and easy to read. The watch should have a light, and the button that turns it on should be easy to operate, even with cold hands. Many divers use the stopwatch mode to count dive time, or set a countdown alarm to indicate the elapse of a predetermined bottom time.