Used on the following models:

CT5500 w/Polar HR - CT55-0XXX-01 (S/N 104948-Below)

CT5500 w/Polar HR - CT55-0XXX-01 (S/N 104949-Up)

X9i - X9-0XXX-04 - Arctic Silver (AXQ)

X9i Cross-Trainer w-Polar HR - X9-0XXX-01 (CXC)