A case for an electronic device is provided. The case can include a front shell attachable to a back shell, the front shell and the back shell at least partially surrounding an electronic device installed in the case. The case can include an attached payment device reader that is electrically connected to the electronic device, an attached product information input device electrically connected to the electronic device, and a battery electrically connected to the electronic device. The case can also include an electromechanical button and a trigger member that can actuate the electromechanical button. The case can also include a rotatable mount that is removably attachable to an outer surface of the case and a hand strap attached to the rotatable mount.