A digital imaging system that allows the user to select and mark objects with markers is disclosed. According to an aspect, a method may include receiving a first efficiency value of a first voltage regulator associated with a first memory device among multiple memory devices. The alternative brief version of the advertisement may be a marketing message that is a static screen presenting a logo or a portion of the recorded advertisement, or may be a condensed version of the actual advertisement. The nozzle is directed so as to provide the sprays toward at least one of: a terrarium, a bird cage, an aviary, a garden or a potted plant, and the portable electric sprayer is allowed to cycle through a plurality of the sprays while unattended. Methods may include decontaminating a contaminated surface with a composition or a foam that may include a surfactant and gelatin and have a pH of less than about 6. Labeling is provided on a surface of the biochip.