Described as an “electromechanical trigger, similar to those found on auto-loading firearms in Olympic competition,” the Electronic Arms eTrigger Adjustable Electronic Trigger System is a replacement for the stock system on a Ruger 10/22.

The system is user adjustable and is powered by a single 9 volt battery.  The unit is not small, and from the photos, it appears to be about the size of an M14 magazine.  The eTrigger sells for $450 on ebay.

On their Facebook page, the company is also showing a prototype of a second generation eTrigger in a bullpup-configured rifle.

Thanks to Cymond for the tip.