This wireless 5.3 USB Bluetooth adapter provides a stable connection of 10 meters , providing clear, practical,and enjoyable sound (Note: Phone calls are only supported in RX mode, not in TX mode). RX mode supports the simultaneous use of two devices, such as car stereo and home stereo, while TX mode supports the simultaneous operation of one device, such as a TV or PC.This 3.5mm car Bluetooth USB adapter is compatible with devices with 3.5mm and USB A interfaces.Does not require the installation of drivers for any compatible devices. With ultra-compact and small lightweight design, put it in your pocket or bag can easily carry this bluetooth audio adapter . (The TV can only be connected in TX mode, USB only provides power supply, 3.5mm audio cable is connected to the TV audio output port, the product's Bluetooth automatically searches and connects to Bluetooth headphones or Bluetooth speakers. Once the connection is successful, the TV audio signal can be transmitted) Specifications： Interface: 3.5mm Aux jack Bluetooth: V5.3 Effective Range:10m/30ft Installation: Plug & play Package Contents: 1 x Bluetooth 2 in 1 USB Adapter 1 x 3.5mm Audio Cable 1 x Instrction manual RX mode: 1.USB input mode: Plug the into the speaker USB interface (the speaker must support USB input),Turn the toggle switch to RX mode.Turn on your phone Bluetooth and search pairing:"B53",and click connect.After connecting the phone, the speaker will prompt that the phone can. Play music and transfer it to the speaker for playback. 2. AUX input mode: Plug the USB port of the product into the 5V power port, Turn the toggle switch to RX mode. Insert 3.5mm audio into the product audio port and connect the audio port of the speaker externally. The speaker must be in audio input mode. Turn on your phone's Bluetooth, click Bluetooth search, find "B53" in the Bluetooth device search, and then click connect. You can try to refresh and scan Bluetooth, if you can not found it. After pairing the phone, the speaker will prompt that the phone can play music and transfer it to the speaker for playback. TX mode: 1.Use on a computer:Plug the B53 into the computer USB interface，turn the toggle switch to TX mode.Turn on the bluetooth headset to pairing state.Wait for the B53 to automatically pair and connect to the Bluetooth headset.Set the audio output of the computer as:USB2.0 Device. 2.Use on TVs:Connect B53 with TV via 3.5 audio cable.Turn the toggle switch to TX mode.Turn on the bluetooth headset to pairing state.Wait for the B53 to automatically pair and connect to the Bluetooth headset. Set the audio output of the TV to:Headphones Note:For TV use, please plug the B53 adapter into a 5V phone charger for power supply. It cannot be directly plugged into the TV for power supply. Insufficient power supply can cause equipment to malfunction.