In certain embodiments, a touch-sensor controller is operable to apply a first voltage to a first drive line. The method includes acquiring a first image and a second image that are captured by a same camera and have a same viewfinder coverage; acquiring depth information according to the first image and the second image; determining a background area of the first image according to the depth information; and performing blurring processing on content in the background area of the first image. The electrodes are electrically connected to the transparent conductive layer. The electronics are configured to drop the current at which the battery pack is operating from a first current level to a second current level one or more times. Further lifting of the cable lifts the channels and the slab for moving. The oxidizer system supplies an oxidizer, preferably in a gaseous state, to the at least on expendable boost propulsion device.