Just only for Android stereos. For our WY series stereos, supports plug and play. No APK needed to be installed. Other Android stereos, please download and install APK first before using (specify in advance). Please try to install apk before purchasing. If the installation is not successful, please do not purchase. Type:A:USB Colour:Black Material:Plastic Package Contents: 1 * Adapter Box 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. For our WY series stereos, supports plug and play. No APK needed to be installed. Please try to install apk before purchasing. If the installation is not successful, please do not purchase. Other Android stereos, please download and install APK first before using (specify in advance). Just only for Android stereos.