1. Make sure it works with your phone
First, check that the watch is compatible with your phone (Android or iPhone) and which features you lose with each. Some, like replying to messages, depend on the system.
2. Battery: days, not hours
Battery life varies a lot with use. Look at two figures manufacturers usually give: battery life in normal use (in days) and with GPS on (in hours). If you go out for long sessions, the second is the one that matters.
3. Built-in or connected GPS
- Built-in GPS: the watch records your route and distance on its own. You can run without your phone.
- Connected GPS: it uses your phone's GPS, so you need to carry it to measure distance accurately.
4. Water resistance
Check what the manufacturer states. “5 ATM” usually means it can be used for surface swimming. “IP68” means it withstands splashes and brief immersion, but isn't always designed for swimming. If you swim, look for a swim mode.
5. Sensors and health
Most measure wrist heart rate, steps and sleep, and some blood oxygen. They're useful for spotting trends, but a watch like this is not a medical device: it doesn't replace a professional's opinion.
6. Display and comfort
- AMOLED: vivid colours and good contrast; usually uses more battery if the display is always on.
- LCD or transflective: easy to read in sunlight and usually lasts longer.
- Check the size and weight: a large watch can be uncomfortable for sleeping or on slim wrists. Also check whether the strap is a standard one you can replace.
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