The only other hardware features on the Nexus 7 are the power / standby key and the volume rocker, both of which are located on the upper right hand edge of the tablet. (techspot.com)
An unpainted strip 1/2 inch wide along the lower edge and 1/4 inch wide along the left and right hand edges suggests that the picture might have been painted in a frame. (tate.org.uk)
Once again you'll find the standby button in place on the right hand edge of the device with volume controls just below. (t3.com)