Bestlap Lap Timer Racing Lap Timer Motorcycle Racing Lap Timer Infrared Ultrared Xt Aim Compatible Reviewhttp://tinyurl.com/p2tox3j Bestlap Lap Timer Racing Lap Timer Motorcycle Racing Lap Timer Infrared Ultrared Xt Aim Compatible This bidding comes with the transmitter and the timer(without battery on the transmitter due to shipping policy).An infrared lap timer will count the lap time for you at 0.02s/lap accuracy which is 30 times as accurate as human hand.It is a complete set of Ultrared Lap Timer that is exactly the same system as UltraLap Mini but with completely new design and workmanship.