LEGO® → Technic → Mindstorms → Mindstorms RCX
9783 284px-LEGO logo.svg

9783 Infrared Transmitter with USB Cable is an extra for the Mindstorms RCX released in 2001. It contained the transmitter and a USB cable to hook it to a computer. It was used to send commands from a computer to a infrared receiver on the RCX brick.