Answers.Body: <p>This is part # bb0042 : <a href="http://www.bricklink.com/catalogItem.asp?P=bb0042" rel="nofollow noreferrer">Electric, Light &amp; Sound Siren 4 x 2 x 4 Jack Stone</a></p>
  
  <p>and here you can hear the <a href="https://www.bricklink.com/catalogItemSound.asp?P=bb0042" rel="nofollow noreferrer">sound</a> </p>
  
  <p>it is from Set <a href="http://brickset.com/sets/4621-1/Red-Flash-Station" rel="nofollow noreferrer">4621-1: Red Flash Station</a></p>
  
  <p>don't know if the battery is replaceable</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-12-30T17:15:42.887Z
Answers.Text: two dead links in this post :/
Answers.UserDisplayName: X-27 is done with the network
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-12-31T01:31:07.783Z
Answers.Text: @X-27wantstoReinstateMonica Thanks! I've fixed the links.
Answers.UserDisplayName: jncraton
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-12-31T15:49:07.197Z
Answers.Text: URL with sound leads to webpage, which no longer has audio file available.
Answers.UserDisplayName: Alex
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2015-05-02T22:10:06.203Z
Answers.LastActivityDate: 2019-12-31T01:30:13.900Z
Answers.LastEditDate: 2019-12-31T01:30:13.900Z
Answers.UserDisplayName: Syberion
Answers.Body: <p>If anyone is interesting in whether the battery can be replaced, the answer's yes-ish.</p>
  
  <p><a href="https://i.sstatic.net/4lfOG.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/4lfOG.jpg" alt="bb42 Disassembled"></a></p>
  
  <p>As you can see in the picture, it's powered by a CR2032. The only hurdle here is that it's welded to the contacts. Not insurmountable though. Also it was glued (or ultrasonically welded) shut, I had to put the orange part in a vise (with some cardboard to protect the plastic) and carefully yet forcefully pull it from side to side. I was surprised at how much force I had to use, so be warned.</p>
  
  <p><strong>EDIT: the fix and putting it back together</strong></p>
  
  <p>Because the top battery contact was spot-welded on, I had to pry the end a bit upward with a knife so I could grab it with pliers and sorta roll/pull the contact off, as you can see below.</p>
  
  <p><a href="https://i.sstatic.net/olZVi.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/olZVi.jpg" alt="Peeling off the battery contact"></a></p>
  
  <p>The battery's also glued to the circuit board, just gently pull it off making sure you don't pull the bottom contact off as well:</p>
  
  <p><a href="https://i.sstatic.net/SWciZ.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/SWciZ.jpg" alt="Prying off the battery"></a></p>
  
  <p>I don't have a picture of the next part, but it's pretty straightforward. I straightened the top battery contact so that the new battery would fit in between. Then I carefully put the circuit board back in the case, and pushed the new battery in between the two contacts (mind the polarity). It should be a very tight fit. At least in my case it was, and it was impossible for the battery to move.
  After that I put some really good glue (something like Pattex Extreme Repair, not a fan of superglue for this application) on the orange top of the case and closed the case.</p>
  
  <p>I used a clamp to keep it that way for the next 24 hours:</p>
  
  <p><a href="https://i.sstatic.net/og10n.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/og10n.jpg" alt="Clamping it all together"></a></p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-07-13T19:22:09.313Z
Answers.LastActivityDate: 2016-07-14T15:15:03.347Z
Answers.LastEditDate: 2016-07-14T15:15:03.347Z
Answers.UserDisplayName: KJdev
Body: <p>I just bought a bulk lot of second-hand bricks and found this odd one inside. It has a black panel on one side and when pressed it plays a screeching sound. Through the transparent purple top I can see two LEDs and a circuit board. </p>
  
  <p>I'm guessing the battery is so low it can't make them glow and the chop isn't getting enough power to play the real sound. It has the LEGO brand on the bottom so I'm pretty sure it is genuine, but I can't identify the piece or the set it could have come from. </p>
  
  <p>Once I identify the brick I'll try to find out if it can be opened without breaking it, so I can replace the battery.</p>
  
  <p><img src="https://i.sstatic.net/fI9ez.jpg" alt="Lego brick with battery inside"></p>
  
Tags: <part-identification><electronics>
Title: Identify brick with internal battery, light and sound
UserDisplayName: Craig
ThreadText: # Identify brick with internal battery, light and sound
  
  (Asked by: username_0 on 2015-05-02)
  
  I just bought a bulk lot of second-hand bricks and found this odd one inside. It has a black panel on one side and when pressed it plays a screeching sound. Through the transparent purple top I can see two LEDs and a circuit board.
  
  I'm guessing the battery is so low it can't make them glow and the chop isn't getting enough power to play the real sound. It has the LEGO brand on the bottom so I'm pretty sure it is genuine, but I can't identify the piece or the set it could have come from.
  
  Once I identify the brick I'll try to find out if it can be opened without breaking it, so I can replace the battery.
  
  ![Lego brick with battery inside](https://i.sstatic.net/fI9ez.jpg)
  
  **Tags:** part-identification, electronics
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2015-05-02. Score: 4 | Accepted answer
  
  This is part # bb0042 : [Electric, Light & Sound Siren 4 x 2 x 4 Jack Stone](http://www.bricklink.com/catalogItem.asp?P=bb0042)
  
  and here you can hear the [sound](https://www.bricklink.com/catalogItemSound.asp?P=bb0042)
  
  it is from Set [4621-1: Red Flash Station](http://brickset.com/sets/4621-1/Red-Flash-Station)
  
  don't know if the battery is replaceable
  
  > **Comments:**
  > **username_2**: two dead links in this post :/  
  > **username_3**: @X-27wantstoReinstateMonica Thanks! I've fixed the links.  
  > **username_4**: URL with sound leads to webpage, which no longer has audio file available.  
  
  ---
  
  ### Answer by username_5 on 2016-07-13. Score: 5
  
  If anyone is interesting in whether the battery can be replaced, the answer's yes-ish.
  
  [![bb42 Disassembled](https://i.sstatic.net/4lfOG.jpg)](https://i.sstatic.net/4lfOG.jpg)
  
  As you can see in the picture, it's powered by a CR2032. The only hurdle here is that it's welded to the contacts. Not insurmountable though. Also it was glued (or ultrasonically welded) shut, I had to put the orange part in a vise (with some cardboard to protect the plastic) and carefully yet forcefully pull it from side to side. I was surprised at how much force I had to use, so be warned.
  
  **EDIT: the fix and putting it back together**
  
  Because the top battery contact was spot-welded on, I had to pry the end a bit upward with a knife so I could grab it with pliers and sorta roll/pull the contact off, as you can see below.
  
  [![Peeling off the battery contact](https://i.sstatic.net/olZVi.jpg)](https://i.sstatic.net/olZVi.jpg)
  
  The battery's also glued to the circuit board, just gently pull it off making sure you don't pull the bottom contact off as well:
  
  [![Prying off the battery](https://i.sstatic.net/SWciZ.jpg)](https://i.sstatic.net/SWciZ.jpg)
  
  I don't have a picture of the next part, but it's pretty straightforward. I straightened the top battery contact so that the new battery would fit in between. Then I carefully put the circuit board back in the case, and pushed the new battery in between the two contacts (mind the polarity). It should be a very tight fit. At least in my case it was, and it was impossible for the battery to move.
  After that I put some really good glue (something like Pattex Extreme Repair, not a fan of superglue for this application) on the orange top of the case and closed the case.
  
  I used a clamp to keep it that way for the next 24 hours:
  
  [![Clamping it all together](https://i.sstatic.net/og10n.jpg)](https://i.sstatic.net/og10n.jpg)
  
  
  ---
  
  