The XT Racing transmitter comes equipped ready to trigger the Ultra-Lap, Mini-Lap and Ducati I/R timers and can also transmit a split signal that is recognized by the Ultra-Lap. A club-racing standard for nearly 10 years, the XT I/R transmitters can either be powered with 4 AA batteries or an external 12v power source using the supplied alligator clips. Also standard on the transmitter is a threaded brass insert for mounting on any standard tripod.