Feature:1. Make your car AUX system and home theater for AV HiFi surround system compatible with Bluetooth, and get music from Bluetooth enabled devices.Specification:Item Type: Car Bluetooth ReceiverMaterial: ABS+MetalColor: As Picture ShownWeight: Approx. 21.0g/0.7ozBluetooth: V4.1Transmission Rate: 3 (Mbps)Built-in microphoneTransmission distance up to 10 metersSleep mode can save energySupport Bluetooth hands-free functionUp to 4 hours of music playback or continuous playbackConnect the wireless music receiver to the 3.5mm headphone jackUse with home speakers, cars, earphones, etc.Built-in lithium battery: 50mAhHow to use:1. Power on/offPower on: Press and hold the on/off button for 5 to 7 seconds until you hear the "ready" sound.Shut down: Press and hold the on/off button for 4-5 seconds until you hear "steady on or red indicator light".2. Use 3.5mm male-to-male audio connector or 3.5mm male-to-male audio cable to connect the receiver to the speaker to connect the speaker and receiver (if there is no sound, make sure it is fully plugged in).3. Pairing(1) Make sure the speaker is in OFF mode(2) Pairing: Press and hold the ON/OFF button for 7 seconds until you hear "ready to connect or make a sound" (press and hold the button until you hear the voice report "ready to connect"). The LED indicator will flash alternately between red and blue. You can now pair.(3) Activate the Bluetooth function of the mobile phone, and refer to the mobile phone user manual for detailed information to search for available Bluetooth devices.(4) Select for "BT310REV or for DL-LINK" from the list.(5) After the pairing is completed, the voice report "connected or short out" (connected or short-circuited), the LED indicator will flash blue alternately..Package List:1 x Car Bluetooth Receiver1 x USB Cable1 x Audio Adapter1 x Manual