Apple’s latest “one more thing” was a doozy: A high-tech watch that CEO Tim Cook hopes will “redefine what people expect” from a wearable device. The watch does much more than tell the time — but what exactly does it do? And what can’t it?

The $350 Apple Watch is meant to be worn throughout the day and relies on its connection to an iPhone for much of its functionality. It can track health activity, communicate with friends and run a wide range of apps. It can even make retail payments.

Here are five things the Apple Watch can do, followed by five things it can’t.

1. Messaging and calling. There’s a variety of ways to communicate with the device: Users can send and receive messages by dictating them or selecting from preset options. There’s a built-in speaker and microphone for phone calls — though it seems those calls have to go through an accompanying smartphone and not directly from the watch to a network. Users can silence incoming calls by covering the watch with their hand. There’s also a new way to communicate called “digital touch,” which lets people draw on the watch’s screen and send the image to friends, almost like a Snapchat doodle.

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