Stimulus-Response Compatibility (SRC) is a major principle in human performance and human factors design. The Theory of Event Coding (TEC) proposed that actions were represented by perceptual consequences called feature codes, which could be activated by perceiving features belonging to external stimuli. SRC effects occurred when perception of external stimuli activated action feature codes, as observed in the Simon Effect, where performance improved when an irrelevant location feature activated the intended action's feature code compared to when it activated the alternative action's code. The TEC model further implied that greater activation of action feature codes increased action execution, suggesting that multiple compatible features might additively enhance performance. This study examined how the number of activated feature codes impacted reaction time and accuracy in a speeded reaction-time task. Participants responded using their left or right thumb to press a left-red button for letter "X" and a right-green button for letter "O" on a touchscreen. Compatibility effects were compared across single- and dual-feature conditions where letter color or location was compatible or incompatible with the button-pressing action. In the dual-feature condition, location and color were presented simultaneously— red "X" on the left was compatible with the left-red button's color and location features, while a right, green "X" was incompatible. In the color-only condition, letters appeared centered with varied colors. In the location-only condition, letters appeared in white with varied locations. Results partially confirmed TEC's prediction that SRC effects were larger for dual-feature than single-feature conditions, driven mainly by incompatible rather than compatible conditions. More compatible features did not significantly enhance performance, while incompatible features significantly interfered with performance in the speeded reaction task.