The documentation is well done, it helps to know everything used in 1 / 4h. This show really has a lot of features for its price: moon phase, tide, stopwatch, countdown to accounts, second time zone, alarm (you can set multiple => convenient for fixed time taken drugs). Functions count-down clock and are very advanced, it is waterproof and lights on a wrist rotation. The only fault I find him is that the wake-up alarm is not powerful enough.