This poster presentation aims to demonstrate an advanced version of clickers, CloudClassRoom (CCR), to conference participants. CCR is written in HTML 5.0 and works on every Internet-capable device without software or plug-ins installation. CCR enables teachers and students to participate in question-answering activates by using their own mobile devices, such as laptops, smartphones, or tablets. By this means, every student in the classroom can express his/her thoughts instantly as well as anonymously. CCR provides the teacher a rough picture of student learning progress in real time. Leveraging the capacity of mobile devices, CCR supports text and multimedia responses. Moreover, CCR is equipped with a role-swapping function; students are endowed with the power to pose questions to the teacher and peers, and then collect responses instantly from the whole class. We expect that the role-swapping function can engage students in deeper learning. The advanced functions of CCR will be demonstrated live, during the poster presentation.