An apparatus for mounting an electronic device includes a case for the electronic device; an attachment portion, formed on the case, having a groove; and a mount constructed to be attachable to a bicycle or a vehicle. The mount includes a locking cap having a protrusion; a rotatable cap having a tab groove wherein the rotatable cap is rotatable with respect to the locking cap; a biased switch having a tab wherein the tab is biased toward the rotatable cap. Here, the tab groove includes an opening and a groove is broadly defined to include an opening. The mount is attachable to the attachment portion by inserting the protrusion of the locking cap into the groove of the attachment portion and rotating the attachment portion or the locking cap with respect to each other.