Product parameters: Material: ABS Colour: Black Bluetooth version: V5.0+EDR Bluetooth protocol: AD2P Working distance: 10 meters Function: Bluetooth audio receiver / Bluetooth audio transmitter Packing list: USB Bluetooth Audio Adapter*1 AUX cable*1 Instruction manual*1 Notice: If it can not work well when you receive it Please read the follow General Q&A carefully before placing an order or leave us a negative review. Q1: Why i can not find the TR6 in my computer? A: When you plug the TR6 to your computer usb port, The computer's usb port just be used as a power supply for the TR6. So the computer don't needs to see it, you just need to connect the ''Transmitter '' port with PC by 3.5mm AUX cable so it will work for PC. Q2: Why i can not find the TR6 in my smart phone bluetooth ? A: When you use the TR6 to pair with your phone, you need to confirm Whether the TR6 has been connected with a 5V DC power via the USB port and has the ''Receiver''port connected with a speaker or music Player or not.If it has been connected well,the right light will on and flash,then you can try to pair it with your phone again. Q3: Why i can not pair with my bluetooth earphone ? A: Please check that the left light of the TR6 is on or not.If not,please check : 1.whether the connection of the TR6 and DC 5V power is ok or not? 2.whether the TR6 has been connected well with your tv or pc or music player via the audio cable. Q4: How to change between bluetooth transmitter and receiver mode. A: There are 2 audio ports.The left on is audio input port, for the devices send the audio to the TR6 and the TR6 transmits it to your bluetooth earphone/bluetooth speaker wirelessly via bluetooth signal. The right port is a audio outport port, the TR6 receives the audio from your phone,Ipad,smart tablet,then it will send them to your speaker or music player via the 3.5mm cable.They can not work at the same time, so when you want to change the mode,just change the connection port of the audio cable. Q5: Why i connect successful,but its don't have sound? A: When at receiver mode,you need to check that whether it has been connected well with your speaker via the audio cable after pairing with your phone. When at transmitter mode,please check the audio cable has been connected well with your pc or Tv,secondly,please check whether the TV or PC are in the Mute state. Q6: Can i use for my wireless keyboard/mouse ? A: Not support !! Our device only can be used as bluetooth receiver or bluetooth transmitter. Can not be used as a WiFi/Wireless adapter to connect with WiFi network and dose not work with keyboard / mouse. Q7: Can i use it to connect between phone and Amplifier/wired speaker/car audio system etc? A: Yes ,but you need to confirm your Amplifier/wired speaker/car audio system have 3.5mm audio output port. Q8: Can i use it to connect between bluetooth earphone/speaker and TV/PC/Tablet/CD Player/MP3/MP4 ? A: Yes. But you need to use the 3.5mm cable plug into your TV/PC/Tablet/CD Player/MP3/MP4's 3.5mm AUX audio port. Then connect with our device. Q9: Why when i connect with the TR6, Its have noise or the sound weak ? A: Its because you used the USB Power supply can not suitable for TR6, You need to change another USB power supply and confirm the USB power supply only support DC 5V output, Can not support 9V/12V or various output.