Answers.Body: <p>After posting, I was finally able to manipulate the image enough to get the right part number (or part of a part number) and found out that it is <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=18602c01#T=C" rel="nofollow noreferrer">18602c01</a>. It's a generic gadget base. This base is part of a LEGO Dimensions video game which had different characters, and you could put the <a href="https://www.bricklink.com/v2/search.page?q=Dimensions%20Toy%20Tag#T=A" rel="nofollow noreferrer">unique base</a> into a <a href="https://www.bricklink.com/v2/search.page?q=Dimensions%20Toy%20Pad#T=A" rel="nofollow noreferrer">Lego Dimensions Toy Pad</a> that would detect which character it was (hence the wireless stuff inside). You could then play as that character in the video game.</p>
  <p><strike>I'm assuming the other larger lettering (<code>30R5</code>, etc) are designations indicating the character the base belongs to.</strike></p>
  <p>As pointed out by Alex in the comments, the <code>30R5</code> etc. codes are manufacture dates.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-28T15:29:28.117Z
Answers.Text: 30R5 - is a production week. In this case it is 30th week of 2015.
Answers.UserDisplayName: Alex
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-28T15:38:12.800Z
Answers.Text: IIRC the wiring is a standard NFC tag, though it's been years since I've played with them so I might be remembering incorrectly.
Answers.UserDisplayName: Nathan Stohlmann
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-28T16:27:07.553Z
Answers.Text: That makes a lot of sense, @Alex, thanks. I wonder how you are supposed to know which base goes to which gadget, once they are apart?
Answers.UserDisplayName: Quentin Skousen
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-28T20:40:08.580Z
Answers.Text: I remember scanning couple of these generic tags I got from Bricklink with smart phone only to find they are all the same. I haven't played the game, but it makes me thing generic tags/bases are somehow tied with character tag/base.
Answers.UserDisplayName: Alex
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-28T22:29:23.823Z
Answers.Text: @NathanStohlmann Probably just RFID, which is admittedly kind of sort of a subset of NFC, but is a tad cheaper to implement.
Answers.UserDisplayName: Austin Hemmelgarn
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-29T05:45:09.560Z
Answers.Text: @AustinHemmelgarn they use NFC. I just checked one tag/base with my phone. And it also says the tag is "writable" so, I guess, it can be reused for something else. I don't have any of character specific ones to check though.
Answers.UserDisplayName: Alex
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-08-28T13:55:42.443Z
Answers.LastActivityDate: 2023-08-28T23:09:46.713Z
Answers.LastEditDate: 2023-08-28T23:09:46.713Z
Answers.UserDisplayName: Quentin Skousen
Body: <p>I bought a crate of Lego's from a flea market, and it has this strange block inside it. It's a transparent blue color, round, and somewhat thick. It seems to be a single piece, I can't find anywhere to separate it. It has wiring inside of an unknown purpose, and I can't see anywhere to connect to the wiring, so I am assuming it's some kind of wireless thing, but I can't imagine to what end. There are at least 3 of them that I have found so far, and they all have different numbers on them - <code>40R5</code>, <code>30R5</code>, <code>16R5</code>, and some smaller numbers that I couldn't quite make out. There is a shallow circle hole on the bottom, but it's just barely too small for a normal brick &quot;dot&quot; to fit into.</p>
  <p>I'm curious what these are for, and what set they might have come with.</p>
  <p><a href="https://i.sstatic.net/81RDt.jpg" rel="noreferrer"><img src="https://i.sstatic.net/81RDt.jpg" alt="enter image description here" /></a></p>
  <p><a href="https://i.sstatic.net/iuqwH.jpg" rel="noreferrer"><img src="https://i.sstatic.net/iuqwH.jpg" alt="enter image description here" /></a></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2023-09-07T18:01:39.180Z
Comments.Text: that's an RFID tag
Comments.UserDisplayName: jsotola
Tags: <part-identification>
Title: What is this transparent round "plate" brick with wiring inside?
UserDisplayName: Quentin Skousen
ThreadText: # What is this transparent round "plate" brick with wiring inside?
  
  (Asked by: username_0 on 2023-08-28)
  
  I bought a crate of Lego's from a flea market, and it has this strange block inside it. It's a transparent blue color, round, and somewhat thick. It seems to be a single piece, I can't find anywhere to separate it. It has wiring inside of an unknown purpose, and I can't see anywhere to connect to the wiring, so I am assuming it's some kind of wireless thing, but I can't imagine to what end. There are at least 3 of them that I have found so far, and they all have different numbers on them - `40R5`, `30R5`, `16R5`, and some smaller numbers that I couldn't quite make out. There is a shallow circle hole on the bottom, but it's just barely too small for a normal brick "dot" to fit into.
  
  I'm curious what these are for, and what set they might have come with.
  
  [![enter image description here](https://i.sstatic.net/81RDt.jpg)](https://i.sstatic.net/81RDt.jpg)
  
  [![enter image description here](https://i.sstatic.net/iuqwH.jpg)](https://i.sstatic.net/iuqwH.jpg)
  
  **Tags:** part-identification
  > **Comments:**
  > **username_1**: that's an RFID tag  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_0 on 2023-08-28. Score: 8 | Accepted answer
  
  After posting, I was finally able to manipulate the image enough to get the right part number (or part of a part number) and found out that it is [18602c01](https://www.bricklink.com/v2/catalog/catalogitem.page?P=18602c01#T=C). It's a generic gadget base. This base is part of a LEGO Dimensions video game which had different characters, and you could put the [unique base](https://www.bricklink.com/v2/search.page?q=Dimensions%20Toy%20Tag#T=A) into a [Lego Dimensions Toy Pad](https://www.bricklink.com/v2/search.page?q=Dimensions%20Toy%20Pad#T=A) that would detect which character it was (hence the wireless stuff inside). You could then play as that character in the video game.
  
  I'm assuming the other larger lettering (`30R5`, etc) are designations indicating the character the base belongs to.
  
  As pointed out by Alex in the comments, the `30R5` etc. codes are manufacture dates.
  
  > **Comments:**
  > **username_2**: 30R5 - is a production week. In this case it is 30th week of 2015.  
  > **username_3**: IIRC the wiring is a standard NFC tag, though it's been years since I've played with them so I might be remembering incorrectly.  
  > **username_0**: That makes a lot of sense, @Alex, thanks. I wonder how you are supposed to know which base goes to which gadget, once they are apart?  
  > **username_2**: I remember scanning couple of these generic tags I got from Bricklink with smart phone only to find they are all the same. I haven't played the game, but it makes me thing generic tags/bases are somehow tied with character tag/base.  
  > **username_4**: @NathanStohlmann Probably just RFID, which is admittedly kind of sort of a subset of NFC, but is a tad cheaper to implement.  
  > **username_2**: @AustinHemmelgarn they use NFC. I just checked one tag/base with my phone. And it also says the tag is "writable" so, I guess, it can be reused for something else. I don't have any of character specific ones to check though.  
  
  ---
  
  