A large piece of plastic, with USB cords and hub/stick/serial adapter embedded into it https://digipres.club/system/media_attachments/files/113/001/678/161/417/162/original/d4b183f74c2f058f.jpeg
I got a bulky tablet computer from ewaste and it turns out the operators of this tablet created an add-on which involved INJECTION MOLDING a piece to hold a USB serial adapter and USB HUB to the back of the tablet. so much work and expense for so little results