Specifications: The 3.5mm AUX universal jack is adopted to support traditional wired earphones, headsets, active audio, car audio and many other devices. With the 3.5mm dual audio headphone cable, all wired speakers will become BT transmission. With one click, you can talk hands-free, enjoy music stored on your phone and even play Internet radio. You can listen to music from your phone or MP3 player in your home or car and 39;s stereo system. Small size and portable, easy to carry. Item Name: 3.5mm bluetooth-compatible Audio Adapter Material: Metal Transmission Range: 25m/82.02ft (Approx.) BT Version: 4.2 Interface: 3.5mm BT Hands-free Call: Support BT A2DP Stereo: Support Frequency: 2.4GHz Features: Portable, 3.5mm Interface, Button Control, Wireless Connection Size: 59mm x 15mm x 12mm/2.32 and quot; x 0.59 and quot; x 0.47 and quot; (Approx.) Notes: Due to the light and screen setting difference, the item and 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x 3.5mm bluetooth-compatible Audio Adapter 1 x Metal Converter 1 x USB Cable 1 x User Manual Portable, 3.5mm Interface, Button Control, Wireless Connection Metal 3.5mm bluetooth-compatible Audio Adapter Portable, 3.5mm Interface, Button Control, Wireless Connection Metal