Description:Product Name: V5.1 Bluetooth Adapter;Interface: USB 2.0;Transmission rate: maximum 10Mbps;Bluetooth-compatible version: Bluetooth-compatible V5.1;Frequency band: 2.400-2.480GHz;Colour: Black;Product size: 21 x 16 x 5mm;Low-power options: 1.2 to 3.6 VI/O;Compatible with Bluetooth-compatible: v1.2/2.0/2.1/3.0/4.0;Supported operating systems: compatible for Windows, Android, Linux, FRERTOS, ThreadX UITRON;Support software: compatible for Microsoft Bluetooth-compatible software, CSR Har mony, Bluez, Bluesol;Support application functions: HFP/HSP (hands-free phone/headphone) A2DP/AVRCP (stereo music) HID/HOGP (keyboard mouse). DUN/PAN (online), PBAPMA; PFTPSPP.GATT, etc.; Packing list:1 x Bluetooth AdapterNote:1. Due to manual measurement, please allow 1-3cm error. Make sure you don't mind before bidding.2. Due to the difference of different monitors, the picture may not reflect the actual color of the product. Thanks. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin