Using this watch is easy. Just put it on your wrist and adjust the band to a comfortable fit. As it has 3 ATM water resistance, it can handle light splashes like washing your hands, but don't wear it for swimming or in the shower. To keep it in good condition, clean the case and band regularly with a soft, dry cloth. When the battery runs out after about 3 years, take it to a professional watch repairer to replace the battery.