BrickLink - Part 58123bc01 : LEGO Electric Power Functions Receiver Unit with Dark Bluish Gray Bottom and Black V2 Print (Version 2) [Electric] - BrickLink Reference Catalog
Infrared Seeker 2852725 | MINDSTORMS® | Buy online at the Official LEGO® Shop US
Lego® Power Functions IR Sender For Micro:bit - Hackster.io
LEGO Power Functions IR Remote Control w/ joystick [Instructions] - YouTube