Thank you for viewing. This is the Sennheiser Bluetooth audio transmitter "BTD 600". Simply connect it to the USB port of your smartphone, PC, or game console (PS5/PS4, Nintendo Switch, etc.) and you can use your wireless earphones or headphones with high sound quality and low latency. Especially since it supports the aptX Adaptive codec, when combined with compatible headphones (such as the MOMENTUM series), it achieves the best sound quality and low latency, which is also ideal for gaming. 【Condition of the product】 Used only a few times, there are no noticeable scratches or stains, and it is in generally clean condition. Operation has also been confirmed and there are no problems. 【Included items】 ・BTD 600 main unit ・USB-C to A adapter ・Instruction manual ・Box