A baseball training aid is provided which includes an audio or visual pitch indicator for simulating a baseball pitcher's pitch. The training aid further includes an impact sensor, preferably in the form of a microphone, for detecting whether a practicing batter's swing is timely, premature or late. The audio signals produced by the microphone are processed by a processor to determine the timeliness of the batter's swing. The results are then communicated to the batter using an audio or visual feedback indicator.