This invention relates to an interactive, multi-sensory digital electronic tutoring system. Each button comprises a cemented carbide body having a rear mounting portion embedded in the drill body, and a front end protruding from the drill body. The IC has a first surface with an active area and a peripheral bonding pad area that includes bonding pads. In one embodiment, an additional crumple zone is present. If the control mode is not stored in the mobile terminal, the mobile terminal may receive the control mode from the host.