Specification: _x005f_x000D_ Origin: Mainland China _x005f_x000D_ Model: BT542 _x005f_x000D_ Color: Black _x005f_x000D_ Material: ABS _x005f_x000D_ Bluetooth-Compatible version: Bluetooth-Compatible 5.4 (EDR+BLE low power consumption, low latency) _x005f_x000D_ Transmission distance: 20 meters (under barrier-free environment) _x005f_x000D_ Supported protocols: A2DP, HSP, AVRCP, HID, ACC, etc. _x005f_x000D_ Working temperature: -20 to 70℃ _x005f_x000D_ Supported operating system: Compatible with Windows 8.1, 10, 11 (driver-free, plug and play) Windows 7 driver installation can be used _x005f_x000D_ Product size: 30*18*8mm/1.18*0.71*0.31inch _x005f_x000D_ Packaging size: 145*95*15mm _x005f_x000D_ Gross weight: 22g _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Note: _x005f_x000D_ 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! _x005f_x000D_ Please allow 1-2cm measuring deviation due to manual measurement. _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Included: _x005f_x000D_ 1 x USB Bluetooth-Compatible 5.4 Adapter _x005f_x000D_ 1 x Instruction Manual 1. Advanced Bluetooth-Compatible 5.4 Technology: The USB BT 5.4 adapter leverages the latest Bluetooth-Compatible 5.4 specification, ensuring backward compatibility with Bluetooth-Compatible 2.0, 3.0, 4.0, 5.0, 5.1, and 5.3 devices. This wide range of compatibility ensures that users can connect a vast array of Bluetooth-Compatible-enabled devices, providing a seamless and efficient wireless experience. 2. Dual Mode and Dual Channel Flexibility: As an audio transmitter receiver, this product supports Bluetooth-Compatible 5.4's dual-mode specifications (LMP 13.X), offering true Bluetooth-Compatible 5.4 standard performance. This feature enables the dongle to handle both high-speed data and audio communication simultaneously, making it a versatile solution for all your Bluetooth-Compatible needs. 3. Enhanced Wireless Range and Low Latency: Equipped with a smart low-power chip and an RF transceiver, the audio dongle offers an impressive Class 2 power level, supporting up to 20 meters of wireless range in open spaces. This extended range, combined with reduced latency, ensures a flexible and powerful Bluetooth-Compatible application, perfect for both entertainment and productivity tasks. 4. Multi-Device Connectivity: The wireless USB adapter supports connection with up to seven devices simultaneously, thanks to its support for multiple protocols including HFP/HSP (Hands-Free Profile/Headset Profile), A2DP/AVRCP (Advanced Audio Distribution Profile/Audio Video Remote Control Profile), HID/HOGP (Human Interface Device Profile/Bluetooth-Compatible Low Energy Human Interface Device Profile), and ACC. This makes it an ideal choice for users looking to connect various devices like headphones, keyboards, mice, and even for Android smartphones. 5. Universal USB Compatibility: The wireless BT 5.4 dongle adapter is designed with USB 2.0/3.0 interface support, ensuring it can be used with a wide range of devices without the need for additional drivers or software. This plug-and-play functionality makes it incredibly user-friendly and a must-have accessory for enhancing the connectivity of your devices.