Specification: Origin: Mainland China BT version: 5.4 (BLE low power consumption, low latency) Transmission distance: 20 meters (barrier-free environment) Support protocols: A2DP, HSP, AVRCP, HID, ACC, etc. Working temperature: -20 to 70℃ Product size: 34*18*8mm/1.34x0.71x0.31inch Packing weight: 29g Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Adapter 1 x Instruction Manual 1 x Blister Color Card Packaging Wide Range of Supported Protocols: This BT dongle supports a variety of protocols, including HFP/HSP (hands-free/headset), A2DP/AVRCP (stereo music), HID/HOGP (keyboard/mouse), and ACC. It is compatible with Android smartphones and provides a seamless connection experience across different devices. Plug-and-Play Compatibility: The BT transmitter and receiver is compatible with Windows 8.1, 10, and 11 operating systems, offering a driver-free, plug-and-play experience. You can simply plug it in and start using it without the hassle of installing additional drivers. Multi-Device Connection: Say goodbye to interference issues. The BT 5.4 dongle receiver supports simultaneous connection with up to 7 devices without any interference between them. This means you can enjoy scenarios like listening to music while using a keyboard or other devices, without any disruptions. Powerful BT Performance: Equipped with a smart low-power chip and an RF transceiver, this BT adapter delivers enhanced BT capabilities with lower latency. It provides a reliable and powerful BT application experience, making data transfer smoother and more efficient. Versatile Compatibility: The USB BT 5.4 dongle adapter is compatible with BT specifications 2.0, 3.0, 4.0, 5.0, 5.1, and 5.3. This broad compatibility ensures that it can seamlessly connect with a wide range of devices, offering flexibility and convenience.