This adapter uses adapter 5.3 for faster transmission efficiency and better compatibility. The adapter supports stereo audio transmission, and in the case of barrier-free, it can support 20 meters transmission, bringing more convenience to your life. Features -Color:Multi -Material:ABS -Size:3.40X1.80X1.00cm/1.34X0.71X0.39in -BT version:5.3 -Transmission rate:3 Mbps -Effective working radius:20 -Frequency:2.4 MHz - Steady transmission: The upgraded chip of this wireless adapter ensures steady and transmission with least delay or noise. - Ultra-compact design: This portable wireless adapter is easy to carry with your anytime and anywhere for quick use in emergency. - Wide compatibility: The upgraded USB wireless adapter can connect multiple devices, such as wireless speakers, keyboards, headsets, etc. - Simple to use: With pairing and no complicated setup, you can adapt your computer for convenient wireless connection of devices. - Stable connection: This wireless 5.3 adapter support long-distance and stable transmission up to 20 meters for freedom of movement. Package list: 3 x wireless adapter 3 x disk 3 x product instruction