A handheld device has a first body part with a first user interface element and a second body part with a second user interface element, and a link mechanism configured to interconnect the first body part and the second body part movably by a user between a first configuration and a second configuration. The first body part and the second body part being stacked in a first order in the first configuration and in a second order opposite to the first order in the second configuration. Each body part has a user interface on its upper surface so that either one can be exposed to a user by changing between the first and second configurations.