The PS4 is arriving amid declines in video game hardware, software and accessory sales.

WSJ: Sony shows PlayStation 4 capabilities, but no box

As a video processor module in a small mini-box, the new accessory is simply placed in-line at the output of any HDMI video source, such as a video game console, DVD or Blu-ray player, media player, or any digital broadcast.

ENGADGET: DarbeeVision announces Cobalt video processor set to enhance any consumer's content

When paired with an iPhone, the phone becomes both a view-finder and an accessory that lets users share video clips by email, post to Facebook or upload to YouTube in real-time.

ENGADGET: Looxcie outs iOS-compatible lifecasting camera, early adopters get the boot

It's a brilliantly conceived and well-built accessory that should be extremely popular with the video and filmmaking crowd.

ENGADGET: Padcaster SLR lens mount for iPad now available: priced at $149 or $189 for Lenscaster combo

PowerA creates innovative accessory products that enhance the world's best video game and mobile technology experiences.

ENGADGET: PowerA's Moga Android game controller grows in Pro model, arrives this spring

It's sold by Nintendo as an accessory for the Wii console and used in skiing, fitness and other video games.

CNN: Getting to grips with Google Earth

For the full year, retail video game sales overall were down 6%, as a 13% increase in accessory sales was more than offset by declines of 6% in software and 13% in hardware.

FORBES: For Video Games, A Christmas Bust

What you see above, and demonstrated in the video after the break, is the gadget that was handed out to attendees who went to learn about the Android Accessory Development Kit.

ENGADGET: Inside Google's amazing Accessory Development Kit demo hardware (video)