Power Functions IR Receiver - LEGO set #8884-1 (Building Sets)
BrickLink - Part 58123bc01 : LEGO Electric Power Functions Receiver Unit with Dark Bluish Gray Bottom and Black V2 Print (Version 2) [Electric] - BrickLink Reference Catalog
Technic Power Function Building Blocks Motor Battery Box IR Remote Receiver Light Compatible Lego Kids Toys| | - AliExpress
LEGO MOC LEGO Technic 8265 Front Loader Fully Motorized IR Control by Mr.Platinum | Rebrickable - Build with LEGO
LEGO Power Functions Infrared Receiver Version 2 (14486 / 58148) | Brick Owl - LEGO Marketplace
Sheepo's Garage: Tips and Curiosities: Power Functions