described is an accessory for a mobile computing device which has a first interface . the accessory include a second interface and a third interface . the second interface compliments the first interface for mating therewith to enable communication between the device and the accessory . the third interface is substantially similar to the first interface for mating with accessories adapted to mate with the first interface . the third interface is mounted on a first outward facing surface of the accessory so that , when the first and second interfaces are mated , the third interface faces outward .