ready for playing TX (Transmitter mode) 1. Connect adapter to computer, TV or other device youneed to use with audio cable,Turn switch on 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 adapter toautomatically pair with 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 Wireless headset or Wirelessspeaker. RX(Receiver mode) 1.Connect adapter to speaker with an audio cable,Turnthe switch on 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 display stops flashing and stayson,and then you can . Color: Black Material: plastic Package Contents: 1 x Adapter Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.