I had this watch for almost 4 years now and it still works great! I work in a hospital and wash my hands a million times a day... I even used this watch to go swimming.  I have not changed the battery yet after all this time.  I love the countdown timer ( can set 1 min, 3 mins, 5 mins, 10 mins, 20 mins, 30 mins)... my only complaint is that the display to set the countdown timer is a little bit too small for me to see.