Accessories

What goes with your comma.

A mount, the harness for your car, and two optional add-ons. Each one has a short guide.

See the accessories

Four things to know about

comma four on the JanQuick Cross Glide Mag Mount

Mounts

Pick a mount

Our favorite quick-release mounts, with photos and prices.

A Chestnut graphics card kit next to a comma four

Chestnut

The external computer

What Chestnut adds, and whether you need it.

Harness

The cable for your car

Each car needs its own harness. Look yours up.

SIM card

Replace the SIM

Swap the SIM in a comma 3X, the right way round.

Photos: JanQuick and comma.ai

More about Chestnut

Do I need Chestnut for comma four? Is Chestnut worth it? What the external computer can do Install Chestnut

Next steps

Pick a device, check your car, or start from the beginner guide.

Choose a deviceCheck my carBeginner guide

CommaGuide is an independent guide, not affiliated with comma.ai.

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