Samsung Galaxy Watch Ultra2 (47 mm, LTE) / Samsung Galaxy Watch6 (40 mm)

The 44 mm model has a 1.5-inch, 480 × 480 display.

This is peak brightness aimed at readability in sunlight, not sustained full-screen brightness.

AOD (always-on display) lets you read the watch without raising your wrist but cuts battery life by roughly a quarter.

According to Samsung, an 8-minute quick charge adds about 8 hours of use; charging is WPC-based wireless.

LTE use depends on country and carrier support; the watch can make calls and use data without a phone.

Receiving L1 and L5 together reduces errors caused by reflected signals near tall buildings and under trees.

BIA estimates body composition using a weak current through the wrist; ECG readings use the electrical heart sensor.

ECG and blood pressure work through the Samsung Health Monitor app only in markets where they are approved; blood pressure needs calibration with a cuff every four weeks. Body composition should not be used by people with implanted devices such as pacemakers or during pregnancy.

Samsung lists 100 m water resistance under ISO 22810 and operation between −20 and 55 °C while worn. EN13319 is a diving equipment standard.

5ATM means water resistance to 50 metres for up to 10 minutes; the watch is not suitable for diving or high-pressure water. IP68 covers 1.5 metres of fresh water for 30 minutes.

Pressing the home button five times starts an emergency SOS.

Pairing with an iPhone is not supported.

Some features, such as the camera controller and health measurements, need a Galaxy phone.