Does the Cool Cube™ need to be plugged in? L Does the Cool Cube™ need to be plugged in? No. Cool Cubes™ use passive PCM technology to sustain the appropriate temperature. Post navigationPrevious post: What are the clear pouches for on the outside of the case/bag? Next post: What is the temperature inside the cooler? Leave a Reply Cancel replyYou must be logged in to post a comment.