Astromech droid R2 Whistler was released as a Walmart exclusive action figure in August 2009 together with a Corran Horn figure. The droid comes with a greenish/silver/white paint application and has a total of 5 joints (dome, 2 legs, 2 ankles). When you rotate the dome it makes the familiar clicking sound and moves the sensor scope in and out of the dome. All three legs have little rolls in them, so you can move the droid around if you choose to do so. The middle leg can be removed, this way you can pose R2 Whistler in a standing pose, or with the 3rd leg attached have him be ready to roll around. There are no other hidden gadgets to be found on the droid. All in all, it's not the most exciting Star Wars figure, but if you like astromech droids (and who doesn't?) you'll probably like this figure.
From the book I - Jedi! Rogue Squadron pilot Corran Horn searches for his wife who has disappeared while on a covert mission to track down pirates. The Force-sensitive Horn is accompanied on his quest by his astromech droid R2 Whistler - who has programs useful in detective work - escape and evasion.