mbogelund Yo dude! It IS the ultra sound module holder: https://www.banggood.com/Multifunction-Bluetooth-Controlled-Robot-Smart-Car-Kits-For-Arduino-p-906628.html?rmmds=detail-left-hotproducts

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mbogelund They ARE the ultra sound module holder. Servo motor goes into the square piece with the round hole, the other square piece is mounted on the servo, and the ultra sound module is attached to this piece using the triangular pieces.

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friedlc Hi I made a video about this, take a look! https://youtu.be/eKcKdMb_nkQ?t=5m9s

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SmileOnion Is a servo gimbal for ultrasound and camera.

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banggood @GrenadeApe Dear customer,
Thank you for your order and before even attempting to explain the reasons leading to this unintended mistake, we would like to sincerely apologize to you.
In our attempt to serve you better and retain you as one of our valuable customers, please contact our customer service representatives by this link: http://www.banggood.com/Contact-Us_hi111
We would highly appreciate if you could send us all the information listed here below:
1.Some photos of the shipping label, which can be found on the external side of the package;
2.The SKU number of the products you received. You can find this information on the label placed on the item itself;
3.Some photos or video to show the entity of the problem;
4.The order number and the product ID.
Looking for your kindly reply. Have a nice day.
Best regards,
Banggood team

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