A chain drive for driving two adjacent parallel shafts, such as two overhead camshafts in an internal combustion engine, includes a drive chain guided by a drive mechanism and chain wheels mounted on the shafts. The substrate is made of Si, the buffer layer contains Ge, and the first and second semiconductor layers both contain Ga and As. The proportions of the pH indicator and the pH modifying agent in the concentrate are selected so that when the concentrate is diluted with an appropriate amount of water, the pH indicator indicates visually by coloration of the composition, whether or not the pH of the water is suitable for acceptable agricultural activity of the chemical. The cup and dispenser combination facilitates the enjoyment of snacks while alleviating the accompanying resulting clutter and disarray. In particular, this invention relates to methods for determining symbol timing, frame timing, and system mode for signal acquisition, comprising the steps of: detecting symbol timing and system mode based on cyclic prefix correlation; and determining a null symbol as a function of a pre-defined number of consecutive symbols and using said null symbol to determine frame timing. A reflection housing is connected to the flashlight housing and includes a light housing that is suspended within the reflection housing and positions the LED light source toward the flashlight handle.