# Some parts that the doc doesn't mentioned

**URL:** <https://discuss.bluerobotics.com/t/some-parts-that-the-doc-doesnt-mentioned/572>\
**Category:** BlueROV2\
**Created:** [December 3, 2016, 5:07pm UTC](https://discuss.bluerobotics.com/t/some-parts-that-the-doc-doesnt-mentioned/572 "2016-12-03T17:07:46Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ooyama](https://avatars.discourse-cdn.com/v4/letter/o/d6d6ee/32.png) [@ooyama](https://discuss.bluerobotics.com/u/ooyama)\
**Post date:** [December 3, 2016, 5:07pm UTC](https://discuss.bluerobotics.com/t/some-parts-that-the-doc-doesnt-mentioned/572/1 "2016-12-03T17:07:46Z")

</div>

After I assembled the bluerov2, I found some parts that the doc doesn’t mentioned. What are these used for?

 ![](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/1X/7a1dc4cb7ba96e54f2baa636613548ff1033ab76.jpg)

---

<div class="post-metadata">

**Author:** ![paul-unterweiser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/paul-unterweiser/32/697_2.png) [@paul-unterweiser](https://discuss.bluerobotics.com/u/paul-unterweiser)\
**Post date:** [December 3, 2016, 8:36pm UTC](https://discuss.bluerobotics.com/t/some-parts-that-the-doc-doesnt-mentioned/572/2 "2016-12-03T20:36:27Z")

</div>

The switch and buzzer are parts from the Pixhawk package that aren’t used in the BlueROV2. The Pixhawk was originally intended for an aerial drone and was re-purposed for ROV use so those parts aren’t needed.