【More stable for dual-channel 3.5MM interface】 B2 usb Bluetooth transmitter and receiver equipped with 2 3.5mm audio interfaces. Let the input and output not interfere with each other. It will work more stable. | 【Fast And Further】 Fast and further working distance than Bluetooth 4.0 Supports Bluetooth speakers, headphones, headsets, keyboards, mice, and more. B2 can work with Bluetooth speakers and stereo headphone maximum transfer rate up to 3Mbpsand transmission distance up to 33ft/10M in open space. (NOTE: Operation range can be affected by physical obstructions and wireless interference) | 【Plug & Play】 No driver needed. One tap changes the mode. TX-Transmitter mode: the blue light flashes, insert the audio cable into the TX port; RX-Receiver mode: the red light flashes and insert the audio cable into the RX port. | 【Mini USB Save Space】 Low profile compact small USB adapter allows you to leave plugged in your laptop or PC without blocking or interfering surrounding USB ports. Save space with this mini wireless USB dongle for Bluetooth speakers, headphones, headsets, keyboards, mice and more. | 【Support Multiple Devices】 B2 portable usb bluetooth adapter not only supports PC Win8/Win8.1/Win10/Win11. It is also compatible with tvboxs such as Amazon fire cube and apple tvbox. Car wired audio converts wireless audio. | 【2 IN 1 Transmitter Receiver】It has wireless transmitting and receiving functions. The transmitter can connect wireless devices. Receive mode can activate wired devices.