Object label
LEGO · LEGO · RCX · 1999
LEGO Robotics Invention System Upgrade Kit (1.5) (3803-1) is a 1999 set from the RCX theme with 70 pieces.
Robotics Invention System Upgrade Kit (1.5) (3803-1) is a LEGO RCX release from 1999 with 70 pcs. GrailHub tracks it as part of the LEGO collecting lane, where set number, theme, release year, piece count, and display appeal all help collectors understand how the set fits on a shelf.
LEGO collectors often browse by theme first, so this page links back into RCX, LEGO, and related LEGO objects. Use those links to compare nearby releases, find other display sets, or move from a single set into the wider theme.
Related LEGO entries currently connected to this object include Mini RCX Brick, 9-Volt Touch Sensor and Leads, and RIS 2.0 Basics Kit. These links make it easier to keep exploring without jumping back to a generic search page.
Add to your shelf
Market snapshot
LEGO catalogue data provided by Rebrickable.
Related objects
Continue through the collecting graph by theme, maker, and category.
