Carrera 71590 Electronic Lap Counter, for use with GO!!! 1/43 and Evolution 1/32)Records exactly (1 100 sec.) the times Can be used with all current Carrera racing track product lines Adjustable width continuously to suit various track width Cars are recognized via infrared light barrier Battery operated, 4 batteries AA LR6 (batteries not included) Item Number: 20071590 Dimensions: 10. 04 x 8. 27 x 4. 25 inches Weight: 1. 59 lb For over 50 years, Carrera has brought the thrilling world of motorsports into homes around the world.