Feature:1. Better Use Experience: Choosing equipment is more accurate, calibrating the volume faster, switching songs is more comfortable, and answering calls is safer.2. Multi Device Interconnection: Bluetooth adapter can realize the interconnection of multiple audio devices, which greatly expands the application range of the device.3. Easy to Operate: When bluetooth adapter in transmitter mode, it can search and display 8 nearby Bluetooth devices for you to choose to connect.4. Built In Antenna: Support 10 meters long distance lossless transmission, no dead angle connection in the living room and meeting room.5. Display Design: The Bluetooth name will be displayed on the display screen, you can choose and view it freely, without mistaken connection.Specification:Item Type: Bluetooth AdapterMaterial: ABSBluetooth Version: 5.1Bluetooth Protocol Support: A2DP and AVRCPPower Supply Input Voltage: USB DC 5VMicrophone Sensitivity: -42dBInput/Output Connection Mode: Transmitting Mode USB or 3.5mm Stereo InterfaceReceiving Mode: 3.5mm Stereo InterfaceCompatibility: Desk computer, for Android system, for ios system mobile phone, tablet and other Bluetooth devices, and audio equipment with audio input interface.Package List:1 x Bluetooth Adapter1 x Audio Cable1 x ManualNote:TX transmission mode:1. After the device is successfully connected, connect the playback device and the product through the 3.5mm audio cable and play music to the Bluetooth receiving device (the personal computer can be played directly through UsB2. When playing music, you can rotate the multifunction button left and right to adjust the volume (0‑30), and you can press the button to play\pause the music.RX receiving mode:1. When playing music, you can press the multi‑function button to play and pause the music. The volume well can be adjusted by rotating the multi‑function button left and right, and you can press and hold the function button for 2 seconds to enter the up and down song switching mode, and you can switch the up and down song by rotating the multi‑function button left and right.2. If there is an incoming call during use, you can answer and hang up the call by pressing the multi‑function button, and adjust the volume of the call by rotating the multi‑function button left and right