The Apple Watch is finally here—almost. Orders open April 10, with the watch actually available on April 24, the company announced today during a live event in San Francisco. The most basic version will cost $349 for the 38-mm model and $399 for the 42-mm version; the mid-level models cost $549 to $1099; and the Apple Edition models cost upwards of $10,000.

The watch was front and center at Monday's event, which Apple name "Spring forward" as a nod to yesterday's beginning of Daylight Saving Time, with Apple's Tim Cook and Eddy Cue tweeting cute teasers on the theme:

The hoopla began early, with Apple's Tim Cook and Eddy Cue tweeting cute teasers:

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Got some extra rest for today's event. Slept in 'til 4:30. — Tim Cook (@tim_cook) March 9, 2015

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I set my clock back an hour. Where is everybody? #AppleLive — Eddy Cue (@cue) March 9, 2015

But Apple Watch wasn't the only reveal. Apple also introduced a new MacBook, HBO Go streaming to Apple devices, and the company's foray into medical research.

Here's everything you need to know from the big show.

Apple Watch

"Let's start with time," Cook said, introducing his run-through of the Apple Watch's feature. Each of the faces is customizable—show meetings and the date, for instance, or don't—bringing what Cook called "a whole new personal dimension to time-keeping."

And, of course, the watch is also a phone—you can receive a call by tapping on the watch. "I have been wanting to do this since I was 5 years old!" Cook exclaimed. "The day is finally here." If talking's not your thing but you want to get a friend's attention, you can send doodles to her watch, drawn in real time on the display. Of you can keep it simple and just send a visualization of your heartbeat.

Notifications and news at a glance

A swipe up from the bottom of the face brings up the Glances feature, which reveals the info you use most often, including the weather, your calendar, and your music. You can even check your heart rate. That metric is joined by new fitness-focused ones in the new Workout app. The app can track your activity no matter what machine you're using in the gym, and provide data such as the distance you've run and the calories burned.

To show off other features, Kevin Lynch presented a day in the life of an Apple Watch wearer (who seems to be someone who works in an office, makes dinner reservations, and takes Ubers). The Apple Watch has much of what the iPhone does, like notifications, Apple Pay, and Passbook. It also has Siri, which is activated as it is when the iPhone is plugged in, by saying "Hey, Siri."

All-day battery life

Like the iPhone, Apple Watch has to be charged fairly often; it'll last 18 hours, and it charges via a snap-on magnetic plug. (Unlike the iPhone, the Apple Watch will nag you, reminding you to stand up from your desk if you've been sitting too long.)

The Apple Watch is dependent on the iPhone, which is where users will download apps and adjust settings in iOS 8.2 and beyond.

Thinnest MacBook ever

The new MacBook, which is 13.1 mm thick and weighs just 2 pounds, makes the MacBook Air look thick. Because the computer is so thin, Phil Schiller explained, the keyboard needed to be redesigned to have thinner and "more accurate" keys, each lit by an individual LED rather than a single backlight. The width of that full-size keyboard, Ive explained via video voiceover, dictated the width of the laptop, which has a 12-inch Retina screen that's brighter and more energy efficient than before.

This MacBook features an all-metal enclosure that at its thickest point is 24 percent thinner than Apple's previous thinnest notebook, the 11-inch MacBook Air. "The definition of portability has changed in the last several years," Cook said.

Schiller demonstrated the new Force Touch Trackpad that can sense a range of pressures. With it, Apple created a new gesture called the "force click," in which a person's finger pushes harder than an ordinary click or tap. A force click on a word in a document will automatically pop up a Wikipedia entry, for example, while a force click on an address brings forth a map.

Inside the MacBook, which starts at 1.3 GHz and can be turbocharged to 2.9 GHz, everything's compressed too. The logic board is the "densest" in any Mac, Schiller said, and this is the first Apple computer without a fan. "What do we do with the rest of that space? We fill it with batteries," he said—more than 30 percent than could fit before. The batteries sit layered atop one another and are shaped to fill out the case as fully as possible, giving the computer a battery that can last, in theory, the length of a workday (or up to 10 hours of movie playback). When it does need to charge, it'll do so via USB-C, a small, reversible plug that's also much more versatile than the current charger.

Like the iPhone, it now comes in three colors: silver, space gray, and gold. This new MacBook starts at $1,299 with a 256GB solid-state drive, and can be had with 512 GB for $1,599. It ships starting April 10.

Get HBO without a cable subscription

A new HBO streaming service, HBO Now, can be streamed for $14.99 per month on any Apple device starting in April. HBO CEO Richard Plepler made the announcement and showed the trailer for the season premiere of "Game of Thrones" (a show whose name elicited much stronger applause from the audience than did "Sex and the City").

Plepler promised the service, which doesn't require an HBO subscription, would be available in time for the April 12 premier of the new "Game of Thrones" season. "We couldn't be prouder that Apple is our exclusive partner at launch," he said.

Apple TV price cut

Tim Cook also announced a pretty significant price drop for the Apple TV, which is going from $99 to $69.

CarPlay gets more support

Cook said: "Every major car brand has committed to delivering CarPlay," Apple's service for integrating iPhone into your car's display. There will be 40 new models shipping by end of the year capable of supporting the service, Cook said.

ResearchKit tries to revolutionize medicine

Jeff Williams took the stage to talk about medical research — "not what you were expecting." To make participating in medical studies easier and more rewarding for participants, not just researchers, Apple is launching ResearchKit and a slew of apps it developed with research institutions like Mount Sinai Hospital and Stanford Medicine.

Williams showed off a Parkinson's assessment to show how users can sign up for and take studies on apps connected to ResearchKit. Apps can also draw from HealthKit data such as your activity level. "It turns iPhone and HealthKit into powerful diagnostic tools," Williams said. For example, your phone's accelerometer and gyroscope can precisely measure your gait and give instant feedback. A tapping test on the iPhone can measure hand tremors.

No matter the ResearchKit app, "Apple will not see your data," Williams promised. "There is nothing more sensitive than your medical data," he said, and users will get to choose what apps get access to their information.

Five ResearchKit apps will be available starting today, Williams said, and the company will release the technology open-source next month.

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