ready for playing TX (Transmitter mode) 1. Connect the adapter to the computer, TV or other device youneed to use with the audio cable,Turn the switch on the side to TX 2. Power on,when display "TX" and flash continuously, and theadapter is in transmitting mode at this time. 3. Turn on your Wireless headphones or Wireless speakers to makesure they are in Wireless pairing mode. Wait for the adapter toautomatically pair with the Wireless headset or Wireless speaker. After successful pairing, the "TX" display stops flashing and stayson, and then you can on your computer or TV, and thesound be transmitted to the Wireless headset or Wirelessspeaker. RX(Receiver mode) 1.Connect the adapter to the speaker with an audio cable,Turnthe switch on the side to "RX" 2.power on, The display show "RX" and flash. At this time,the adapterisin receiving mode. 3.Turn on Wireless, search for"GT72" and connect. Aftersuccessful pairing, "RX" on the display stops flashing and stayson,and then you can . Color: Black Material: plastic Package Contents: 1 x Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.