Warm tips:There are two different types of adapter, please check it before your purchase Type 1: Bluetooth 5.3 Adapter Type 2: Bluetooth 5.0 Adapter Eager USB Wirele Bluetooth 5.3 Adapter Feature 1:Supports wirele Bluetooth 5.3 protocol, backwards compatible with Bluetooth 5.2/4.2/4.2 LE/4.0/2.1+EDR specification, supports A2DP/SBC/AAC/HSP/AVRCP/HID protocols, and supports Feature 2:Driver-free, plug and play, for system Windows 8.1/10/11 (Apple systems not supported) Feature 3:Low latency, low power consumption, high sound quality, anti-interference, long distance double upgrade, maximum transmiion distance up to 20M Feature 4:Can be connected to 5 different types of devices at the same time, can be connected to mouse/keyboard/game controller/speaker/headset/phone/tablet and other Bluetooth devices Attention: 1. Only WINDOWS system computers are supported, not Apple or other systems. 2. Not supported for use in cars. 3. This product can only be used on PC, not on TV. 4. Applicable system Windows 8.1/10/11 (Apple system is not supported), if you have any questions, please contact our customer service for more information. 5. This product only supports audio transmiion, does not support video transmiion. 6. If your computer has Bluetooth, you will need to turn off your computer's Bluetooth before using this product.