Samsung Galaxy Watch7 44 mm Bluetooth / Apple Watch Series 9 (45 mm, GPS, aluminium)

The 2000-nit peak helps readability in sunlight; using the always-on display shortens battery life.

LTPO is a panel technology that can lower the refresh rate dramatically, letting the display stay dimly on when the wrist is down. The 1-nit minimum avoids glare in a dark room.

A fast wireless charging puck is in the box, but no wall adapter.

Fast charging requires Apple’s fast-charging cable and a suitable adapter.

The L5 band helps separate signals reflected by tall buildings and trees; dual-frequency mode can increase battery use.

It is a single-frequency (L1) receiver; drift in cities can be more likely than with dual-frequency watches.

Availability of ECG and blood pressure depends on country and paired phone; blood pressure measurement is not offered in the US.

The electrical sensor is for ECG recordings; the optical sensor measures pulse with light. Temperature sensing tracks overnight changes in wrist temperature.

Energy Score turns sleep, activity and heart data into a daily readiness score; AGEs Index is experimental and not for diagnosis.

This version has no cellular connection; calls and notifications come through the paired phone.

5ATM describes water resistance suitable for surface swimming; it is not for diving or high-speed water sports.

Suitable for swimming. Ion-X is the strengthened glass used on aluminium cases; steel cases use sapphire crystal.

Double tap lets you answer notifications or calls by tapping the thumb and index finger of the watch hand together twice, without touching the screen.

The watch collects sensor data, the paired iPhone calculates the value and shows it in the Health app. Watches bought outside the US are not affected.

Ultra Wideband lets you locate an iPhone 15-family phone with Precision Finding showing direction and distance; availability varies by region.

It cannot be used with Android phones.