[BT5.0 Wide Compatibility] BT ensures faster transmission and maintains a stable connection up to 50 feet (about 15.2 meters) in open areas. [Safe hands-free calling] The built-in microphone can free your hands when answering calls, allowing you to drive safely and conveniently. Dual link connects to 2 Bluetooth devices at the same time, and stream music from any of them. [Upgrade your wireless life] Bluetooth can convert your old home wired speakers or headphones to wireless, enjoy streaming music and long boring car trips. [Mini Size-Powerful Energy] The aluminum ultra-thin body design is equipped with a 3.5 mm AUX jack to entangled cables. 1.5 hours per charge, enjoy wireless music, battery life is 5 hours. [Smart connection and easy to use] The integrated design is convenient for answering calls and playing music, and automatically connects to the previous connected device every time the power is turned on. Material:plastic colour:Black Package Contents: 1 x bluetooth aux adapter Only the above package content, other products are not included. Note: Light 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.