CALIFORNIA WARNING: This product can expose you to chemicals, including lead and DEHP, which are known to the State of California to cause cancer and birth defects, or other reproductive harm. For more information, go to https://www.p65warnings.ca.gov.
Gottlieb opto photo-transistor receiver board.
Reference:
MA-1331
XO-993 photo-transistor only (receiver)
31241 (RX)