1. Output the car head unit video signal to the secondary screen, like headrest 2. Only available for Android system, compatible with for Android 6.0 and above 3. Easy to Use, Plug in your for Android Stereo's USB port and install the APK Interface: USB video signal converter to CVBS/RCA interface for Android Big Screen Stereo Compatibility: You must check with the vendor of for Android Big Screen Stereo to ensure that your for Android host hardware platform supports USB video output function. If your for Android host hardware cannot support USB video output function, this adapter will not work in your system.. Note: Installation guide not included, Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color: Black Material: plastic Package Contents: 1 x USB To CVBS Video Output 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.