The BBPOS Chipper 2X BT is an older Bluetooth reader. It still works with the app, but it's no longer sold. Newer readers like the Stripe Reader M2 have replaced it.
To use one, you'll need an iPhone, iPad, or Android device with Bluetooth running a current version of iOS or Android (whatever the latest Payment for Stripe app supports). If you're setting up in-person payments for the first time, we'd steer you to a current reader instead. See our list of supported readers.