Easy to Control Press 3s for the first time use until the blue indicator light flash,It is turned on Press 3s at any time, the Red Indicator light will flash red 2 times/s,the product shutdown after voice Prompt 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 Technical Specifications Bluetooth Version Bluetooth V4.1 EDR Hands free function, with Music Control (Pause or Play) Built in microphone for phone call Use with home stereos, speakers, car stereos, headphones etc Mini size, easy to carry, you can carry it in your pocket Operating Distance Reach up to 10 meters in open space Working Time Up to 4 hours Wide Application Widely compatible with iPhone Samsung Android Smartphone, iPad, Tablet PC, Car and Home Audio Music Streaming Sound System, A/V receivers. Note This adapter cannot control volume, Control the Volume over the phone or control the volume on the car audio. In The Box Wireless Bluetooth 4.1 Audio Receiver with Mic 1 pcs Micro USB Cable 1pcs