LEGO Medium Stone Gray Power Functions Infrared Receiver Version 1 (58123 / 89969)

LEGO Medium Stone Gray Power Functions Infrared Receiver Version 1 has been used in at least 13 LEGO sets over the past 17 years, since it was first used in 2007. You can also find this part in at least 4 other colors. It has the design IDs 58123, 89969 which can usually be found molded into the bottom of the part.