This handset has adjustable volume,a pushbutton to talk and a belt clip.Push thr top button to pick up and hang up.press the side button to talk (which lowers the incoming audio) and roll the side to change the volume.

Featurs Included :

Measures 3inches long x 2.5 inches wide.
ABS plastic.Requires 2AAA batteries (not included in ur Package) .
Plug into your phone with a 3.5mm headphone jack.

Source Perpetualkid

Yesterday,night NYC (Time Square) got a new Exynos5Octa Core Mobile Processor on Samsung Galaxy S4 and upcoming Samsung Galaxy Note 3 with 6.3inch display.

      Game Pad : 

                 If you click on Accessories section and scroll right a couple of time you will  find that Game Pad which is available from 4inch to 6.3inch on Samsung handsets.

                     It can be paired with Bluetooth otherwise with NFC (Near Field Communication).It has Dual Analog sticks, and 4actions to surf Asphalt 8 Zone Fire.

Via Trusted Reviews
 Source  Samsung