This is a Bluetooth receiver from ELECOM. You can connect your favorite headphones or earphones and use them wirelessly. It has a built-in microphone, so it also supports calls. I'm selling it because I no longer use it. Manufacturer: ELECOM Model Number: LBT-PAR02AVBK Color: Black Communication Standard: Bluetooth 4.1 Codec: SBC Communication Distance: 10m Microphone: Supported USB: Micro-B Overall, it shows signs of use, but it works normally. *This is only the main unit. Manual, packaging, and USB charging cable are not included.