6.0 Bluetooth dual-mode dual-channel, compatible with Bluetooth 3.0, 4.0, 5.0, 5.1, 5.3, and 5.4 specifications.Intelligent low-power chip and RF transceiver provide low-latency, flexible, and powerful Bluetooth applications.Supports Cass2 power level 20 meters (in open air environments)Supports Bluetooth 5.4 dual-mode specifications (LMP 14.5X true Bluetooth 6.0 standard)Supports USB 2.0/3.0 interfacesSupports simultaneous connection of multiple devices (up to 5 devices)Supported operating systems: for Windows 8.1/10/11 (driver-free, plug-and-play); for Windows 7 requires a driver installation.Supported protocols: HFP/HSP (hands-free phone/headset), A2DP/AVRCP (stereo music), HID/HOGP (keyboard and mouse), AAC, Android smartphones, etc.Bluetooth version: 6.0 (BLE low power, low latency)Transmission range: 20 meters (obstacle-free environments)Supported protocols: A2DP, HSP, AVRCP, HID, AAC, etc.Due to batch variation, product appearance, color, and printing may vary, but this will not affect performance.Color:BlackMaterial:plasticPackage Contents:2 * USB AdapterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.