Used tp-link Bluetooth 4.0 Nano USB Adapter UB400. I am selling this because I no longer need it after replacing my computer. Purchased in June 2021. It was working without any problems until just before listing. The items included are the adapter itself, the installation guide, and the original box. Product Features (AI-generated) By plugging it into a desktop PC or older laptop that doesn't have Bluetooth, you can connect wireless headphones, mice, keyboards, etc. The nano-sized, ultra-compact design makes it unobtrusive even when left plugged into the PC. Specifications Standard: Bluetooth 4.0 Size: Nano size (ultra-compact) Features: Low latency, power saving Supported OS: Windows 10 / 8.1 / 8 / 7 / XP I will clean it with an alcohol wipe, put it in the original box, wrap it in air cap (bubble wrap), and then ship it.