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A 3.5mm headset jack and power button are located on the top of the EVO 4G. The 3.5mm headset jack causes a hump to be formed in the back, but it is a stylish curve.
There is a long button on the right side to control volume up and down on the EVO 4G.
The mic opening, microUSB port, and HDMI port are found along the bottom.