Description:1. The enhanced Data Rate technology support greatly improved the data transmission rate of blue tooth technology. 2. You can send files, videos, and music between a smartphone and a PC via a blue tooth wireless adapter. 3. Enhance anti-interference ability and stability, new technologies have been adopted to reduce the loss of transmission efficiency caused by interference in the 2.4 GHz band.Specification:Color: BlackMaterial: ABSWireless version: V5.0Transmission distance: 10-20 metersCompatible device: win8/10/11 or above without driver (win7 needs to install the driver) Apples OS is not supportedMaximum number of supported devices: 7Product list:1* USB Blue Tooth AdapterNotes: Due to the lighting effects and shooting angles, there is a color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size.