this kind of product is very suitable for students and white-colars .it is the best-seller and still to be continue.what you need to do is to plug its connection into computer's USB hole. few minutes later you would like to enjoy your delicous lunch.if you want to keep your honey lunch fresh and keep warming,just make it power when it still warm till anytime you want to eat.appriciate temperature with temperatur-controlled keep lunch fresh.