Fangrui Product Details Computer-installed Bluetooth Wireless Connection To Headphones/speakers; Upgrade The Bluetooth Function Of Old Computers/laptops To Break Space Constraints Built-in Ceramic Antenna, Barrier-free 5-10 Meters Long-distance Transmission Anti-interference Ability, More Stable Signal Product Name: Digital Display Bluetooth Adapter Bluetooth Version: V5.0+ Frequency Range: 2400-2483.5mhz Frequency Response: 10hz-20khz Input Parameters: Dc 5v-500ma Host Weight: About 68g Charging Time: About 1 Hour Interface Type: Aux//usb/tf Effective Distance: 10 Meters Without Obstacles Battery Capacity: 3.7v/400mah Lithium Battery Signal-to-noise Ratio: 90db Peripheral Support: U Disk/tf Card Bluetooth Protocol: Hfp/a2dp/avrcp Format: Mp3/wav/wma/ape/flac Product Size: 100x54x33(mm) Colour:black Material:plastic Package Contents: 1 X Bluetooth Receiver 2 X Audio Cable 1 X Usb Charging Cable 1 X Manual In English And Chinese Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Differ