What XBee Bluetooth modules are used on quad?

And does Roboshop still carry these XBEE parts?

What do you mean by quad?

You may find all the Xbee bluetooth modules here: https://www.robotshop.com/en/catalogsearch/result/?q=xbee+bluetooth&order=relevance&dir=desc

Lynxmotion Symmetric Quadruped Kit. I built one a few years ago.
I’ve studied all the bluetooth modules, and have a few on order. I see one with a DB9 in the Quad’s pix.
Alan