Logitech Bluetooth Audio Receiver for Wireless Streaming
Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: Logitech K380 Multi-Device Bluetooth Keyboard (Dark Gray) Bundle with Knox Gear USB Bluetooth 4.0 Dongle Adapter (2 Items) : Electronics
Logitech Bluetooth Music Receiver review: Forget the aux cord, this little box turns any stereo into a wireless music system - CNET
Amazon.com: Logitech USB Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics
Logitech C-UV35 USB Bluetooth Receiver for Mouse Keyboard MX5000 MX5500 | eBay