Unnecessary consumption of power of an auxiliary primary battery 2, and other problems have been inherent in a conventional battery system. In one embodiment, the invention comprises a system that comprises a fresh storage vessel for receiving and storing fresh. The invention further relates to hybrid cotton seeds and plants produced by crossing the cultivar DP 449 BGRR with another cotton cultivar. The temporal variation device can modify the time progression rate to be faster or slower in the area. Preferably, the first and second divisors N and M are each integers greater than one, and the second divisor M is not an integer multiple of the first divisor N. Thus, the optical module has a configuration capable of containing the light receiving unit in the housing without interfering with the housing.