This description from the manufacturer

• Record your PlayStation or Xbox gameplay to a Mac or PC
• Built-in live streaming to YouTube and Twitch
• Full HD 1080p capture
• Lag-free HDMI pass-through to the TV
• Flashback Recording feature to record retroactively
• One-click sharing to YouTube, Facebook and Twitter
• Compact size and easy setup

The included software makes it easy to capture every move you make, even if you forget to press the record button: The unique Flashback Recording feature lets you timeshift your gameplay, so that you can simply slide back in time on your Mac or PC and hit the record button retroactively. With one click, you can share your gameplay with your friends and fans on YouTube, Facebook and Twitter. Even better, the tailor-made Elgato Game Capture HD software allows you to quickly trim your gaming scenes and pass them on to your favorite editing software.

Your skills. Immortalized.

The gaming experience is all about sharing. With Elgato Game Capture HD, you can record your PlayStation or Xbox gameplay to a Mac or PC and share your journey with friends, fans and generations to come.

Be the best.

Elgato Game Capture HD uses advanced hardware H.264 encoding to capture your gameplay in stunning 1080p Full HD, while keeping the file size low. At the same time, your console’s picture is passed through to your TV via HDMI, so you can keep on enjoying your game on the big screen – in pristine quality, without delay.

Be efficient.

Elgato Game Capture HD doesn’t need a lot of cables or even a power supply to record your game: With direct Xbox 360 and PlayStation 3 input, you can use a single cable to connect it to your console. And since it’s only about the size of a deck of cards, you can be sure it will not intimidate your other gaming gear.

Be prepared.

You never know when a moment worth capturing arises. With Flashback Recording, Elgato Game Capture HD has your back. Flashback Recording lets you timeshift your gameplay, so that you can simply slide back in time on your Mac or PC and hit the record button retroactively. Re-living greatness has never been this easy.

Be heard.

Use any microphone that’s connected to your computer, find the perfect balance with your game audio and even automatically lower the volume of your game whenever you speak. With the new Live Commentary feature, all of this is only a click away. Now it’s up to you to think of something brilliant to say.