A system for rolling a vehicle includes first and second guide tracks. Accelerometers are provided to detect changes in attitude, and temperature sensors are provided to detect changes in temperature. The plurality of the manual keys described include a seesaw key with a pivotal pin, and the dome sheet has a flat sheet portion formed around the dome portions and includes an inner region extending inwardly of dome portions to be selectively depressed by a seesaw key, and an outer region extending outwardly of the dome portion. Many such embodiments can maintain relatively high performance, while providing robust security for each LU. The comparison by the second comparator is controlled based on the result by the first or second comparator.