Is the LEGO Batman Key Light (5005739-1) still popular among collectors?

Yes, as a 2019 themed keychain, it appeals to collectors of the LEGO Batman line.

What is the condition of the 5005739-1 Key Chain?

The listing details will specify the condition, but it is a 2019 item with 0 pieces.

No, this item is listed specifically as a Key Chain with set number 5005739-1.

Name: LEGO Batman Key Light (5005739-1)
Brand: LEGO

Key Chain

Key Chain · 2019

Theme · Key ChainPieces · 0Set Number · 5005739-1Year · 2019

Used

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New / Sealed

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Live on eBay now

Converted from USD at the ECB reference rate — sold comps are US-market sales.

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Is the LEGO Batman Key Light (5005739-1) still popular among collectors?: Yes, as a 2019 themed keychain, it appeals to collectors of the LEGO Batman line.
What is the condition of the 5005739-1 Key Chain?: The listing details will specify the condition, but it is a 2019 item with 0 pieces.
Is this item part of a larger LEGO Batman set?: No, this item is listed specifically as a Key Chain with set number 5005739-1.