The iCade Jr. was originally launched in January 2012 at CES. It represents a smaller iPhone/iPod Touch sized version of the original iPad-sized iCade. Like its big brother, the iCade Jr. connects to your iPhone or iPod Touch using Bluetooth. This model was originally designed to fit the iPhone 4/4S and 4th Generation iPod touch form factors, but is said to work with the iPhone 5 “if you leave the top lid hinged back”.
The controller has an arcade stick, four front and rear buttons and works with existing iCade-compatible games.
Source: Mac Rumors.