An electronic device, comprising: a casing , comprising a panel arranged on a side thereof and a plurality of side plates adjacent to a periphery of the panel , a circular opening defined on the panel , and a first fixing structure arranged on an internal edge of the circular opening ; a circular frame , rotatably arranged in the circular opening and closing the circular opening , a second fixing structure arranged on an external edge of the circular frame , the second fixing structure disposed on the periphery of the circular frame is slidable with the circular frame along a circumferential direction in the first fixing structure , and the circular frame is configured to be rotatable relative to the circular opening and the second fixing structure is limited by the first fixing structure ; and a display , embedded in the circular frame and exposed on the panel , wherein the casing is configured to be placeable on any one of the plurality of side plates as a bottom of the casing , and the circular frame is rotatable for adjusting a direction of the display according to the placing position of the casing on any one of the plurality of side plates as the bottom so as to display an information which can be squarely watched, wherein the first fixing structure comprises a sliding latch and the second fixing structure correspondingly comprises a curve slot arranged concentrically with the circular frame , the second fixing structure comprises another sliding latch and the first fixing structure correspondingly comprises another curve slot arranged concentrically with the circular opening , wherein the another sliding latch is extended of a curved, the sliding latches respectively snap the curve slots to fix the circular frame on the casing ; and wherein the sliding latches are slidable in the curve slots respectively when the circular frame is rotated in the circular opening . a casing , comprising a panel arranged on a side thereof and a plurality of side plates adjacent to a periphery of the panel , a circular opening defined on the panel , and a first fixing structure arranged on an internal edge of the circular opening ; a circular frame , rotatably arranged in the circular opening and closing the circular opening , a second fixing structure arranged on an external edge of the circular frame , the second fixing structure disposed on the periphery of the circular frame is slidable with the circular frame along a circumferential direction in the first fixing structure , and the circular frame is configured to be rotatable relative to the circular opening and the second fixing structure is limited by the first fixing structure ; and a display , embedded in the circular frame and exposed on the panel , wherein the casing is configured to be placeable on any one of the plurality of side plates as a bottom of the casing , and the circular frame is rotatable for adjusting a direction of the display according to the placing position of the casing on any one of the plurality of side plates as the bottom so as to display an information which can be squarely watched, wherein the first fixing structure comprises a sliding latch and the second fixing structure correspondingly comprises a curve slot arranged concentrically with the circular frame , the second fixing structure comprises another sliding latch and the first fixing structure correspondingly comprises another curve slot arranged concentrically with the circular opening , wherein the another sliding latch is extended of a curved, the sliding latches respectively snap the curve slots to fix the circular frame on the casing ; and wherein the sliding latches are slidable in the curve slots respectively when the circular frame is rotated in the circular opening . <EOS>