2-in-1 Wireless Transmitter Receiver - Enjoy wireless audio with no more cords limit. In TX mode, insert 3.5mm aux jack to non-Bluetooth , gym equipment/gaming devices to transmit audio to wireless headphones. In RX mode, insert to wired speaker/car inpout port, you can receive the HD audio form smartphone via Bluetooth. Bring new life old . Mini Bluetooth 5.3 Audio Adapter - The Bluetooth 5.3 technology, ensuring lower consumption, more stable and faster wireless transmission. You just need to connect it with Non-Bluetooth devices, then they can be upgraded to Bluetooth devices. Safe Hands-free Calling - Built-in mic for answering calls, it equipped with noise cancellation technology, suppress environmental noise, pick up voices more accurately. One button to answer/hang up calls. This aux to bluetooth adapter also supports broadcasting voice notification from navigation. Provides you with the safety and convenience of hands-free calling while driving. New Upgrade TF Card Mode - Insert the TF card directly and connect it to your vehicle, amplifier, wired audio or any aux jack and you'll have a audio experience. If wired headphones are connected, it can be used as an MP3 player to play TF card music directly. Supports multiple formats(MP3/WMA/APE/WAV/FLAC). Plug and Play - Just plug and play, no driver needed, easy to setup. The Bluetooth adapter's built-in battery supports Tpye-c fast charging. It can be used continuously for about 5-7 hours after a full charge. Ensures enjoying your favorite wireless content whenever you want. LED display viewing is more convenient, real-time display of volume and power, and the usage status is clear at a glance. Colour:grey Material:plastic Package Contents: 1 x Bluetooth Adapter Only the above package content, other products are not included. Note: Light reflection 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.