Transmission distance: 20m ultra long transmission distance (no ), strong signal Transmission rate: 3Mbps, providing high-speed file and audio data transmission Ultra low delay and fast link, intelligent sleep energy saving, 24 bit check to resist interference, adaptive frequency hopping to reduce crosstalk Fully downward compatible with Bluetooth 2.0, Bluetooth 2.1 and Bluetooth 3.0 specifications The original driver management software is easy to use, powerful, and supports multiple application expansion Name: Bluetooth adapter Bluetooth version: 5.0 downward compatible Supporting profiles: network, dial-up, fax, LAN access and headset : Windows7/8/8.1/10/11 Interface: USB2.0 rate: 3Mbps Receiving/sending range: 10-20m color: Black : ABS Size: 2.2 x 1.6 x 0.7cm Package Contents: 2 x Bluetooth adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.