A nonvolatile semiconductor memory recovers variation in the threshold of a memory cell due to disturbance related to a word line. Two grips are connected to the two wings respectively. As a user swings the bat, the moment of inertia for the bat changes such that swing mechanics and timing are improved. A cam may be configured on a paddle and provide for fine tuning the position of a Hall effect sensor. The invention allows using either transistor outline can packaged lasers or lasers in chip on submount.