An assembly for a mobile terminal, or a portable electronic device such as a cellular telephone or a personal digital assistant, is provided that includes a chassis with a locking perimeter and at least one covering, such as a front and/or a rear cover, with a locking edge. A cover may include a void or window for viewing a display of the electronic device and a keymat to control the electronic device. The chassis may include a convex groove in which a bracelet or wrap may be included.