The disclosure generally relates to the novel compounds of formula I, including pharmaceutically acceptable salts, which are CGRP receptor antagonists. In the cooling device, both ends of the tube are connected to the closed container at different position of the heat radiation wall to communicate with the closed container, so that the heat radiation fin is enclosed by the heat radiation wall and the tube. The protective cover is mounted to the base plate to cover a majority of the printed circuit board assembly while extending a predetermined distance below the mounting rails to shield the mounting rails and the base plate from contact.