Features: brand new and high quality Transmitter Mode: Wirelessly stream audio from a non-Bluetooth TV, home stereo or CD player to a Bluetooth-enabled headset/speaker/receiver. Receiver Mode: Wirelessly stream audio from a Bluetooth-enabled phone, tablet, or computer to a wired stereo, speakers, or headphones. Wireless noise reduction technology, clearer sound, easier and faster connection, more stable signal, faster transmission.Transmit and receiver 2 in 1. RX mode: Please use a 3.5mm audio cable to connect the product to the audio device, and find the MSD168 in the Bluetooth-compatible settings of the mobilephone for pairing. The blue light flashes during the pairing process, and stops flashing after the pairing is successful. Low-latency audio ensures that your Bluetooth-compatible wireless device can provide sound synchronized with visual media. TX mode: Please use 3.5mm audio cable/RCA audio cable to connect the product to TV and other devices, TX mode will automatically search for other bluetooth-compatible receiving devices (such as bluetooth-compatible earphones, bluetooth-compatible speakers, bluetooth-compatible receivers, etc.), the red light flashes when pairing, After successful pairing, the red light stops flashing. Specifications: Name: Bluetooth-compatible USB Adapter Size: approx 34mmx17mmx12mm/1.34x0.67x0.47in Material: ABS Model: MSD168 Pairing name(Receiver mode ): MSD168 Technologies: BT5.0, A2DP, AVRCP (receiver mode only) Operation Range: Up to 10m / 33ft (without any blocking objects Package Includes: 1 PC x USB Transmitter Receiver 1 PC x 3.5mm Aux Cable(1M/39in) 1 PC x Manual note: 1. If the device is in one mode for a long for time, it needs to be powered on twice to switch to another mode. 2. If the device has just switched modes and wants to switch to another mode immediately, just power it on again. 3. Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. 4. Please allow 0-1cm error due to the manual measurment.