A twist-off cap bottle opener having a varying cap engaging radii. From an incoming data packet that includes data and a training sequence, a modified data packet is generated that includes the data, the training sequence, and at least one additional copy of the training sequence. This semiconductor memory device includes a load capacity adjustment circuit that adjusts the timing of starting up the gate of the reference cell in accordance with each location of the connection of the memory cells to the word line. This is achieved by the capability to skip one or more steps in the stepping sequence, if appropriate, for each relevant executed step, with the number of skipped steps, if any, being proportional to the magnitude of the deviation from the target brightness. The concentration operator determines a concentration of evaporated fuel in the fuel tank based on the differential pressure detected when the opposite ends of the measurement passage communicate with the fuel tank and the fuel flows in the measurement passage.