my faithful friend for 17 years. never any problems. small but so powerful, multifunctional, and in addition a 1 minute timer, 3 minutes, 5 minutes, 10 minutes, ... directly without further manipulation. Increasingly, hourly beeps and alarms are perfectly audible (even in the subway, train or ambient noise) .This I found with this Casio. One downside: no backlight! Also, allergies to the metal of the watch (compensated with the installation adhesive on the case back and the strap change. long, the hypoallergenic materials for anything that touches the skin? ... One day ???