Bluetooth 4.0 USB Module (v2.1 Back-Compatible) : ID 1327 : $11.95

TP-Link UB400 - Bluetooth 4.0 USB Adapter for Computer/Notebook Equip Your Computer with Bluetooth Bluetooth 4.0 Nano USB Adapter UB400 Link to Your Computer via Bluetooth UB400 makes Non-Bluetooth PCs or laptops Bluetooth-capable. Simply plug in the UB400, connect your Bluetooth devices and enjoy. Plug and Play for Win 8, Win 8.1, and Win 10 For Win 8, Win 8.1, and Win 10, just plug UB400 into your computer to enjoy a fast, convenient Bluetooth connection.

TP-Link (UB400) Adapter Nano USB-Bluetooth 4.0

【Multiple Uses】 Bluetooth 4.0 USB Dongle Adapter can easily add Bluetooth feature for your computer, enables the computer to wirelessly connect more

Bluetooth 4.0 USB Dongle Adapter - Maxesla Wireless Bluetooth Transmitter Receiver for Windows 10/8 / 7 / Vista/XP Laptop PC for Bluetooth Speaker

Bluetooth 4.0 USB Module (v2.1 Back-Compatible) : ID 1327 : $11.95 : Adafruit Industries, Unique & fun DIY electronics and kits

The USBBT1EDR4 USB to Class 1 Mini Bluetooth® Dongle lets you add Bluetooth wireless capabilities to a laptop or desktop computer through USB, with

Mini USB Bluetooth 4.0 Adapter - 50m (165ft) Class 1 EDR Wireless Dongle

Plugable USB Bluetooth 4.0 Low Energy Micro Adapter (Compatible with Windows 11, 10, 8.x, 7, Classic Bluetooth, Gamepad, and Stereo Headset Compatible) : Electronics

Mini USB Bluetooth 4.0 Dongle - 50m - Bluetooth & Telecom Adapters, Networking IO Products

Add Bluetooth capability to your computer super fast with a USB BT 4.0 adapter. This adapter is backwards compatible with v2.1 and earlier, but also supports the latest v4.0/Bluetooth Low Energy. Inside lies a CSR8510 Bluetooth USB host.