Systems and methods for performing a transaction with a headless point-of-sale or automated teller machine device are disclosed. A working memory may stores N respective timer values for N count-down timers, where N is an integer greater than one. Other devices and methods are described. A control device is provided for controlling an engine inlet temperature of an airexhaust gas mixture by controlling a ratio of cooleduncooled air andor cooleduncooled exhaust gas in the airexhaust gas mixture. A second connecting pin set is disposed in the housing, has one end connected to the circuit board, and another end extended into a connecting portion of the housing. An image processing method includes estimating the degree of color fringing in a color image based on the color image that is generated by photo-electrically converting an object image and formed from a plurality of color planes.