For most of the time they’ve existed, a watch just had to tell time. When seemingly every facet of everyday life went digital, we saw watches with features like alarms and stopwatches, and even calculators, but it wasn’t until the last few years that watches really got some brains added. Now they’re digital assistants, sport coaches, DJs, wallets, and secondary screens for your phone. The sheer variety of smartwatches out there is overwhelming. But start with these three things and you should be able to narrow down your choices.