This a sweet little computer. Athon GPS-3 Lap timer. It is a lap timer, tachometer, speedometer, and shift light. Best lap feature and capable of split times by setting multiple gps readings around the track. Start/Finish and 3 intermediates. It was used for 2 trackdays at Mid-Ohio on 9/22-23. It is awesome! Read the link below for a full desription. This unit is powered by 2 AA batteries. No beacon needed, GPS technology is great and super accurate. $100 off and still new. http://www.starlane.com/en_Athon_GPS...shiftlight.htm It comes with the original box and the user manual. I'll also include some wire to attach the tach, and a mounting bolt I drilled for safety wire. Pick up some velcro and you're set. I need to upgrade my rear shock so this has to go. $450 shipped to your door.