<b>Easy to Control </b><br>Press 3s for the first time use until the blue indicator light flash,It is turned on.<br>Press 3s at any time, the Red Indicator light will flash red 2 times/s,the product shutdown after voice Prompt.<br>If no Bluetooth device is connected to this adapter,the blue indicator light will flash red 2 times/s,and will be off in 5 minutes. <br><br><b>Bulit-in Microphone </b><br>The wireless bluetooth 4.1 receiver audio adapter makes talk to family and friends a breeze. Perfect for hands-free calling when driving.

Extra-long built-in battery provides up to 4 hours playing time and only need 1.5 hours to charge it fully. PORTABLE: Ugreen Wireless Music Adapter comes with the mini size 50 x 40 x 14.3mm, ultra-compact . Easy to carry with, and won't add much bulk to you.

<br><br><b>Note </b><br>This adapter CANNOT control volume.<br>Control the Volume over the phone or control the volume on the car audio. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-01-342-0793, indicating validated use in U.S. government and defense logistics supply chains.