Abstract: A base unit of a sports swing mechanics training device receives from a swing detector a swing detection message indicating a swing motion by a player, and in response, displays a visual symbol for a predetermined period of time. When the device receives a user selection of a visual symbol from the player, it is compared with the displayed visual symbol. If they match, the device indicates a symbol match. Otherwise, the device indicates a symbol mismatch. The base unit is placed at a location where the displayed visual symbol would be visible to the player immediately following contact with a ball when the player's eyes are in a desired position during the swing motion. The device trains players to keep their heads and eyes correctly directed at the point of collision with the ball during and immediately following the ball collision.