USB-BT4 is a plug-and-play Bluetooth dongle that supports Classic Bluetooth 2.0, High-Speed Bluetooth 3.0 and Bluetooth Low Energy (BLE) 4.0. You can use it with nRF8001 (e.g. MOD-nRF8001) and any other Bluetooth device which is 2/3/4 compatible.
The dongle supports voice and data. It comes with a mini CD for Windows installation. Linux distributions with kernel 3.11 or higher should have implemented Bluetooth LE 4.0 support, also.