 In addition to the 4 @.@ 8 @-@ inch ( 120 mm ) touchscreen , the S III has several physical user inputs , including a home button located below the screen , a volume key on the left side and a power / lock key on the right . At the top there is a 3 @.@ 5 @-@ millimetre ( 0 @.@ 14 in ) headphone jack and one of the two microphones on the S III ; the other is located below the home button . The S III is advertised as having an MHL port that can be used both as a micro @-@ USB On @-@ The @-@ Go port , and for connecting the phone to HDMI devices . However , a retailer later discovered that Samsung had made a modification to the electronics of the port such that only the adapter made specifically for this model by Samsung could be used . 
