This is the Traxxas DTS-1 Drag Timing System. FEATURES: Turns any stretch of smooth asphalt into a personal RC car dragstrip Compatible with the Traxxas Link app and TQi Docking Base (not included, sold separately) Laser precise dual-beam staging and speed trap Race up to 330ft (quarter scale 1/4 mile) Pro and Sportsman trees Stage and pre-stage beams Dual beam finish line Testing and race modes Winner indicator Foul indicator Practice tree High Intensity LEDs WiFi connectivity (optional plug-in WiFi module required) INCLUDES: DTS Staging Tree with Laser Pre-Stage, Stage and Finish Line Beams Finish Line Console with Safety Ramp Six Laser Reflectors Instruction Manual REQUIRES: AA Batteries: Eight COMMENTS: TQi and Traxxas Link (not included) adds Reaction Time, Elapsed Time, Trap Speed, Bracket Racing Dial-In, and Event Moderator features. jxs 06/29/12 ir/jxs