Feature 1 Aluminium Alloy: This BT AUX adapter adopts aluminium alloy connector which ensures high durability. Small and portable, it won't take up the extra space in your car. 2 Easy Connection: This AUX BT receiver is easy to use. Just plug it into the 3.5mm jack and power it through the USB port. When you start the car, the BT adapter will automatically connect to your phone. 3 Memory Function: This car BT 5.3 receiver can memorize up to 5 devices and allows users to pair with 2 devices at the same time. Inbuilt microphone serves hands free calls. 4 11yd Wide Range: This BT 5.3 car adapter supports a maximum transmission range of 11 yards without delay. SBC coder decoder provides clear sound. 5 Wide Application: This USB 2.0 to 3.5mm audio adapter can be used in car but also can be usded for home wired speakers and amplifier stereo audio system.Item Type: BT AUX AdapterMaterial: Aluminium AlloyColor: SilverBT Version: 5.3Sensitivity: -42+3dBSignal to Noise Ratio: > 90dBAudio Transmission Mode: FLAC WAV APE MP3BT Delay: < 180msTotal Harmonic Distortion+N: < 0.1%Frequency Response: 20Hz to 20KHzEffective Transmission Distance: 10 Meters / 11yd Package List1 x BT AUX Adapter1 x User Manual