TP-LINK UB400 / Bluetooth 4.0 / BLE /

Quick overview from the supplier:

TP-Link Bluetooth 4.0 Nano USB Adapter, Nano Size, USB 2.0 Bluetooth 4.0 – Applies the latest Bluetooth 4.0 with low energy (BLE) technology and it is backward compatible with Bluetooth V3.0/2.1/2.0/1.1 Driver Free – Plug and Play for Win 8, Win 8.1, and Win 10 Nano-Sized – Ultra-small for convenient portability with reliable high performance Supported Operating System – Supports Windows 10/8.1/8/7/XP