Serial Bluetooth Adapter - RS232
[UCBT232B]

I use this for public outreach astronomy to control Celestron CG5-ASGT and CGEM mounts through the hand controller. It allows full use of the hand controller while connected, a big plus over WiFi dongles. So far I've used it with Samsung Tab4 8inch and Acer A500 tablets, Samsung Note5 phone and Windows 10 laptop.