The 1983 Vivitar TEC 35 Autofocus has autofocus from 1m (3.3ft) to infinity, motorized film advance plus rewind, built-in electronic flash which pops up by itself when needed plus returns to the body when through, CdS meter for programed auto exposure, and a Built in 10 second self-timer with beep plus LED emitting. It also has a unique LCD (Liquid Crystal Display) that blinks when the camera back is opened to remind you to set the proper ISO, verifies whether the film has been correctly loaded, and blinks to warn you that there is only enough power for two more rolls of film. Loading the film is as simple as dropping the cartridge into the open back and laying the film leader across the empty spool on the other side then closing the back and pushing the shutter release button causes the film to advance automatically to frame one. When the last picture on the roll has been taken, a built-in sensor causes the film to rewind automatically. The specifications for the camera are a 35mm F2.8 Pentax four elements, three groups lens with built-in 1A Skylight filter, Lens openings from F16 to F2.8, shutter speeds from ½ a second to 1/500 of a second with an automatic ''B'' mode for time exposures. Because of the additional electronics incorporated in the camera, the energy sources required include 2-AA batteries (alkaline manganese) and 1 built-in lithium battery. Dimension are 5.3x2x3 inches and the weight 14.1 ounces without batteries.