I didn't know they came with integrated bt.
is this what you'r talking about?
https://www.amazon.com/DFRobot-Beetle-BLE-Arduino-Bluetooth/dp/B014KQHEH6/ref=sr_1_10?hvadid=241903167528&hvdev=c&hvlocphy=9022814&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=3191247056314405571&hvtargid=kwd-30165826293&keywords=arduino+bt&qid=1551801469&s=gateway&sr=8-10&tag=googhydr-20