Ultimate Accessories (3801-1) is a RCX LEGO set released in 2000 with 45 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing RCX sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 24 unique part types.
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Buying checklist
Quick context before you buy this set used or verify a marketplace listing.
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Release year
2000 (26 years ago — may be retired)
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Catalog scale
45 parts listed · 24 inventory lines tracked
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Minifigures
No minifigs in inventory (brick-only or Technic set)
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Build manual
No digital manual in our catalog — check the box tab or LEGO.com
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Gray era
Pre-2004 set — may use old light/dark gray instead of bluish gray
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Shipping weight (est.)
~100 g for parts inventory (excludes box/minifig packaging)
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Before you buy used
Run the completion checker, compare photos to the inventory, and check live listings for sealed pricing
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Market value
No estimate on BrickID yet
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Parts in this set
24 parts · updating…
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Brick 1 x 2 without Bottom Tube3065 · ×2 · Trans-Yellow -
Brick 1 x 2 without Bottom Tube3065 · ×2 · Trans-Green -
Brick 1 x 2 without Bottom Tube3065 · ×2 · Trans-Red -
Brick 1 x 2 without Bottom Tube3065 · ×2 · Trans-Dark Blue -
Brick Round 1 x 1 Open Stud3062b · ×2 · Trans-Red -
Brick Round 1 x 1 Open Stud3062b · ×2 · Trans-Dark Blue -
Brick Round 1 x 1 Open Stud3062b · ×2 · Trans-Yellow -
Brick Round 1 x 1 Open Stud3062b · ×2 · Trans-Green -
Control Unit, RCX Remoteupn0200 · ×1 · Black -
Dish 2 x 2 x 2/3 Light Reflector71128 · ×1 · Chrome Silver -
Large Figure Skeletal, Limb, Angular, 2 x 7 with 2 Ball Joints32173 · ×2 · Yellow -
Light Brick 1 x 2 with Single Side Light6035 · ×1 · White -
Sensor, Rotation2977c01 · ×1 · Blue -
Sensor, Touch879 · ×1 · Light Gray -
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole32184 · ×2 · Black -
Technic Axle and Pin Connector Perpendicular Double32291 · ×2 · Light Gray -
Technic Axle Connector 2 x 3 with Ball Socket, Open Sides32174 · ×4 · Yellow -
Technic Beam 1 x 15 Thick32278 · ×2 · Black -
Technic Beam 1 x 5 Thick32316 · ×2 · Black -
Technic Beam 1 x 7 with Fan32177 · ×2 · Black -
Technic Beam 1 x 9 Bent (7 - 3) Thick32271 · ×2 · Black -
Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin32250 · ×2 · Black -
![Technic Beam Triangle Thin [Type I]](https://cdn.rebrickable.com/media/parts/ldraw/7/2905.png)
Technic Beam Triangle Thin [Type I]2905 · ×2 · Light Gray -
Wire with Brick 2 x 2 x 2/3 Pair, 20L5306bc020 · ×2 · Black