1. Receive/Transmit, 2-In-1 Function, Accept Rx+Transmit Tx 2-In-1 Design, Switch Between Dual Signals With One Button, Simple And Convenient To Use, Suitable For A Of Devices 2. When The Red Light Turns On, It Means Entering The Launch Mode. The Default Is In The Launch Mode When The Machine Is Turned On. 3. When The Blue Light Is On, It Means Entering The Receiving Mode. Press And Hold The Function Key To Switch Modes. 4. When You Have An Incoming Call In Receiving Mode, Press The Button To Answer The Call Hands-Free 5. Dual Signals Can Be Switched With One Click, Capable Of Receiving And Transmitting Product Model:T7 Bluetooth Audio Receiving And Transmitting Adapter Input Voltage:DC5V Applicable Models:Computers, , Projectors (Transmitting Mode)/Speakers, Headphones, Car Machines, Calls (Receiving Mode) Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:Black Material:ABS Size:About 45x20x11mm Package Contents: 1 * Audio Adapter 1 * 3.5mm Audio Cable 1 * English Manual 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.