LEGO Sound Sensor 9845-1
LEGO Sound Sensor (9845-1) is estimated at about $53 sealed as of Sep 2026 (retail $35). Retired 2016 · 1 pieces · 2007 Mindstorms.
- Set number
- 9845-1
- Theme
- Mindstorms
- Subtheme
- NXT
- Year
- 2007
- Pieces
- 1
- Minifigures
- 0
- RRP
- $35
- Market value
- $53 (Estimate, Sep 2026)
- Used value
- $7
- Released
- 2007
- Retirement
- Retired in 2016
Sound Sensor value by year
From $41 in 2016 to $53 (Estimate, Sep 2026): +31%. Its highest year was 2019, at $56.
| Year | Value | Change |
|---|---|---|
| Estimate, Sep 2026 | $53 | +10.3% |
| 2024 | $48 | +0.2% |
| 2023 | $48 | +6.1% |
| 2022 | $45 | +69.7% |
| 2021 | $27 | −12.0% |
| 2020 | $30 | −45.2% |
| 2019 | $56 | +15.7% |
| 2018 | $48 | +15.2% |
| 2017 | $42 | +2.9% |
| 2016 | $41 | — |
Median of each year's market prices, sealed, in US dollars.
Frequently asked questions
How much is LEGO Sound Sensor (9845-1) worth?
LEGO Sound Sensor is worth approximately $53 on the secondary market today, based on current listings and completed sales. BrickStats updates this value daily.
Is LEGO Sound Sensor retired?
Yes — Sound Sensor (9845-1) has been retired by LEGO and is no longer in production. Retired sets have fixed supply, which is why their prices are driven purely by the resale market.
Has LEGO Sound Sensor gone up in value?
Yes. Sound Sensor launched at $35 and now trades around $53, an increase of 52.4%. See the price history chart for how it got there.
What is the price per piece for Sound Sensor?
At its $35 retail price across 1 pieces, Sound Sensor works out to about $34.990 per piece. Collectors often use price per piece to judge whether a set is good value.
Is LEGO Sound Sensor a good investment?
Sound Sensor currently trades 52.4% above its $35 retail price, and it is retired, so no new supply is entering the market. Past performance is not a prediction — condition, packaging and how long you hold all affect what a set actually sells for. BrickStats reports the numbers rather than giving investment advice.
Why is LEGO Sound Sensor so expensive?
Sound Sensor was released in 2007 and has since retired. Once LEGO stops producing a set, the only supply is what is already in circulation, so sealed copies in good condition compete for a shrinking pool of stock. That scarcity, not the parts, is what moves the price.