```{seo}
:description: Find a detailed list of components inside the Duckiebot DB21J4 model box, otherwise known as the Duckiebox.
:keywords: duckiebox, duckiebot, whats in the box, bill of materials, duckiebot bom
```

```{needget}
- A Duckiebot (`DB21-J4`) box: [get one from the Duckietown online store](https://get.duckietown.com/products/duckiebot-db21?variant=41543707099311) 
---
- Knowledge of nominal content of the Duckiebot DB21-J4 box.
```

(setup-db21j4-whats-in-the-box)=
# What's in the Duckiebot (`DB21-J4`) Box?

What should you expect to find inside a Duckiedrone (`DD24`) box, and what is each component? 

First things first: here is how a Duckiedrone box looks like:

```{figure} ../../_images/assembly/db21j/duckiebot-db21j-box.png
:name: the-db21j-box
:width: 300px
:align: center
:alt: Duckiebot box

The *yellow* Duckiebot box.
```

And is here an incomplete representation of the components in the box. Continue scrolling for the complete list.

```{figure} ../../_images/assembly/db21j/db21-allcomponents.jpg
:name: in-the-db21j-box
:width: 90%
:align: center
:alt: Duckiebot box content - selected components

What's inside the Duckiebot DB21-J4 box (selected components).
```

## List of components (`DB21J4(v2)`)

```{admonition} This list is representative. Details vary between production rounds.
We are always striving to improve, so minor details - e.g. the number and type of nuts and screws - can change between different manufacturing rounds of the same Duckiebot model. Most notably, all Duckiebots labeled as DB21J4(v3) (post September 2025) will replace chassis-related metal screws with nylon ones, and improve the omnidirectional wheel design, as well as presenting minor chassis design modification to accomodate for more Jetson Nano development kits. 
```

| Number | Component                                                            |
| -----: | :------------------------------------------------------------------- |
|      1 | Bottom deck                                                          |
|      2 | Lower lateral supports                                               |
|      1 | Middle deck                                                          |
|      1 | Upper-left lateral support                                           |
|      1 | Upper-right lateral support                                          |
|      1 | Back support                                                         |
|      1 | Top deck                                                             |
|      1 | Back pattern plate                                                   |
|      2 | Motor mounts                                                         |
|      1 | Camera mount                                                         |
|      1 | Front bumper (FB) PCB                                                |
|      1 | Back bumper (BB) PCB                                                 |
|      1 | Omni-wheel                                                           |
|      2 | Front wheels                                                         |
|      2 | DC Motors with Encoders                                              |
|      1 | Jetson Nano camera                                                   |
|      1 | Camera cable                                                         |
|      1 | Inertial Measurement Unit (IMU)                                      |
|      1 | Time of flight (ToF) sensor                                          |
|      1 | Jetson Nano 2GB (JN2), Jetson Nano 4GB (JN4) or No Jetson (variants) |
|      1 | Duckietown Hut v 3.15                                                |
|      1 | 64GB Class 10 U3 micro SD card                                       |
|      1 | Duckiebattery                                                        |
|      1 | Wi-Fi dongle                                                          |
|      1 | Screen                                                               |
|      1 | Shutdown button                                                      |
|      1 | DC fan                                                               |
|      1 | FCC label sticker                                                    |
|      1 | Cross screwdriver                                                    |
|      1 | Camera calibration pattern                                           |
|      1 | Micro SD to USB adaptor                                              |
|      1 | Back pattern sticker                                                 |
|      3 | Metal stand-off M2.5x18+6mm M-F                                      |
|      3 | Metal hexagon stand-off M3 25mm F-F                                  |
|      2 | Spacer M6x12x1.5                                                     |
|      4 | Nylon screw M2x8                                                     |
|     14 | Nylon screw M2.5x12                                                  |
|      2 | Round head tapping screws metal (3x20)                               |
|      4 | Metal screw M3x30                                                    |
|     30 | Metal screw M3x12                                                    |
|     30 | Metal nut M3                                                         |
|     16 | Nylon nut M2.5                                                       |
|      4 | Nylon nut M2                                                         |
|      1 | Jetson to Battery cable                                               |
|      1 | Battery to HUT(Ext5V) power cable                                     |
|      1 | HUT to Battery charging cable                                         |
|      1 | HUT to BB cable                                                      |
|      2 | Motor to HUT cables                                                   |
|      1 | FB to ToF cable                                                      |
|      3 | HUT to FB, IMU cable                                                 |
|      1 | Screen to HUT cable                                                   |
|      1 | Button to HUT cable                                                   |
|      2 | Duckies                                                              |
|      1 | Instructions card                                                    |
|      2 | Duckietown Stickers                                                  |


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