We suggest to use this dongle that has been tested and work well with Pix-Star:
ORICO - BTA-402 - USB Bluetooth 4.0 Micro Adapter Dongle
it's on amazon.com at the price of 9.99 us$.
it works very well and it's quite cheap!
IMPORTANT REMARK FOR IPHONE USERS!!!!!!!!
iPhone does NOT support sending pictures or any file by Bluetooth. This is valid till now for any version of the iPhone include old ones but also latest iPhone 5 and 5s. We still don't know for the iPhone 6 but we guess it will remain the same...
You may double check this with Apple on on the internet, but be careful if you try to send pictures from your iPhone to your pix-star using the Bluetooth connection it won't work not because of Pix-Star but because it's not implemented in the iPhone...
Sending pictures by email from iPhone of course does work without any problem!!!