Not long ago, the ability to hold a phone conversation on one’s wristwatch was mere fantasy relegated to spy dramas and science-fiction movies. Today, smartwatches have brought voice calling, global tracking, health monitoring, music libraries, and an array of futuristic features into the real world at an affordable price. The modern smartwatch is a wearable command center from which you can manage communication, navigate anywhere on earth, assess your heart rate, check the weather, and even track sleep patterns. Oh, and it also tells time. Here’s what to look for in a smartwatch to match your tastes and lifestyle.