Features: <br>CSR4.0 - Adopt CSR8510 chip, which is in line with Bluetooth 4.0 technical specification and dual mode transmission. <br>20m transmission distance - Longer transmission distance (no barrier) with strong signal. <br>3Mbps transmission rate - More stable transmission rate, providing high-speed file and audio data transmission. <br>USB2.0 - USB2.0 interface is more versatile. <br>Lightweight and ultra-mini & portable. <br>Fully backward compatible with Bluetooth 2.0, Bluetooth 2.1, Bluetooth 3.0 specifications. <br>For CSR original drive management software: For CSR Harmony drive management software is easy to use, powerful, and supports a variety of application extensions (For Microsoft OFFICE software). <br>Ultra-low latency speed connection, intelligent sleep wake-up energy saving, 24-bit CRC check to resist interference, adaptive frequency hopping to reduce crosstalk. <br>Specification: <br>Type: Bluetooth Adapter <br>Model: BTD-401 <br>Weight: Approx. 20g <br>Size: Approx. 2.2 * 1.5cm / 0.9 *0.6in <br>For CSR8510A10 original chip: Yes <br>Bluetooth standard: V4.0 + EDR dual mode <br>Support Bluetooth CLASS 2: Yes <br>USB interface: USB2.0 standard, downward compatible with 2.0/3.0 standard <br>Operating frequency band: 2.4GHz - 2.483GHz, using FHSS (frequency hopping spread spectrum) technology <br>Operating range in open space: Approximately 20-50 meters <br>Intuitive software operation interface, no complicated settings: Yes <br>Applicable to operating systems: For Windows/ME/2000/XP/2003/VISTA/WIN7/8/8.1 <br>For Windows XP SP2/VISTA/WIN7/8/8.1, it is inevitable to drive, easy to carry! (For WIN8/8.1, it can be connected directly to the Bluetooth headphone speaker, other drivers need to be installed) <br>Data transfer rate: Up to 3Mbps <br>Sensitivity < -85dBM <br>Security: Built-in password and user authorization <br>Power: USB interface directly powered <br>PC/ for Mac: Bluetooth wireless dial-up Internet access (requires Bluetooth mobile phone and other devices) <br>PC: Bluetooth wireless LAN, which can make 8 computers with Bluetooth devices become a small wireless network at the same time. It can also use this function to access the Internet through a Bluetooth wireless base station or a computer with a Bluetooth connector. Base station or computer is connected to the Internet) <br>PC: Bluetooth wireless fax (computer needs to have fax software installed) <br>PC/for Mac: Bluetooth wireless file transfer <br>PC/for Mac: Bluetooth wireless data synchronization <br>PC: Support Bluetooth virtual serial port <br>PC: Support Bluetooth wireless printing <br>PC: Support Bluetooth headset <br>PC /for Mac: support Bluetooth interface (Bluetooth mouse and Bluetooth keyboard) <br>Package list: <br>1 * Bluetooth Adapter (NO Drive CD) <br>Note: <br>1. Please note that the package ONLY include a Bluetooth adapter. <br>2. Please allow slight error due to manual measurement. Thanks for your kind understanding. <br>Connected Devices(Includes all Bluetooth v4.0/v3.0/v2.1/v2.0/v1.1 devices): <br>1. Bluetooth headset <br>2. PDA; <br>3. Mobile phone; <br>4. Keyboard, mouse; <br>5. GPS positioning system; <br>6. Printer; <br>7. Laptop; <br>8. Other Bluetooth devices; <br>9. Desktop computer <br>P.S. For MAC system can only be used in versions 10.2-10.84. <br>Driver Installation: <br>1. There are three options during the installation process: open, disable, select PC/desktop. <br>2. Please plug in the Bluetooth adapter after installation.1、CSR4.0 - Adopt CSR8510 chip, which is in line with Bluetooth 4.0 technical specification and dual mode transmission. <br>2、Fully backward compatible with Bluetooth 2.0, Bluetooth 2.1, Bluetooth 3.0 specifications. <br>3、20m transmission distance - Longer transmission distance (no barrier) with strong signal. <br>4、3Mbps transmission rate - More stable transmission rate, providing high-speed file and audio data transmission. <br>5、USB2.0 - USB2.0 interface is more versatile.