Samsung Galaxy 40mm Watch 5

Built-in blood oxygen measurement on Samsung Galaxy Watch 5 lets you check the amounts of oxygen in your bloodstream at any time. Oxygen saturation is directly linked to physical performance, so monitoring your blood oxygen can help you maintain your health. Know your sleep with our improved sleep tracking technology. Plan your bedtime, detect snoring, understand and track your sleep stages (awake, light, deep, REM) via 8 animal sleep symbols representing your sleep type. Better nights lead to better days.