The tire temperature sensors measure the surface temperature of tires: with a 35° field of view, they  sample temperatures between -20 and 120°C and provide a 0-5V output signal. The four sensors come in a kit including an IR temperature controller device, which is necessary for connection to MyChron.

In the box:

IR temperature controller, four tire temperature sensors, power cable, two 4 pin 712+719 patch cables 100 cm length, two 4 pin 712+719 patch cables 200 cm length. User manual freely downloadable from AiM web site.