1、CSR0 - Adopt CSR8510 chip, which is in line with Bluetooth 0 technical specification and dual mode transmission. 2、20m transmission distance - Longer transmission distance (no barrier) with strong signal. 3、3Mbps transmission rate - More stable transmission rate, providing high-speed file and audio data transmission. 4、Fully backward compatible with Bluetooth 0, Bluetooth 1, Bluetooth 0 specifications. 5、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). Features: 1. CSR 4.0 - Adopt CSR8510 chip, which is in line with Bluetooth 4.0 technical specification and dual mode transmission. 2. 20m transmission distance - Longer transmission distance (no barrier) with strong signal. 3. 3Mbps transmission rate - More stable transmission rate, providing high-speed file and audio data transmission. 4. USB 2.0 - USB 2.0 interface is more versatile. 5. Lightweight and ultra-mini & portable. 6. Fully backward compatible with Bluetooth 2.0, Bluetooth 2.1, Bluetooth 3.0 specifications. 7. 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). 8. Ultra-low latency speed connection, intelligent sleep wake-up energy saving, 24-bit CRC check to resist interference, adaptive frequency hopping to reduce crosstalk. Specification: Type: Bluetooth Adapter For CSR8510A10 original chip: Yes Bluetooth standard: V 4.0 + EDR dual mode Support Bluetooth CLASS 2: Yes USB interface: USB 2.0 standard, downward compatible with 2.0/ 3.0 standard Operating frequency band: 2.4GHz - 2.483GHz, using FHSS (frequency hopping spread spectrum) technology Operating range in open space: Approximately 20-50 meters Intuitive software operation interface, no complicated settings: Yes Applicable to operating systems: For Windows/ME/2000/XP/2003/VISTA/WIN7/8/ 8.1 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) Data transfer rate: Up to 3Mbps Sensitivity < -85dBM Security: Built-in password and user authorization Power: USB interface directly powered PC/ for OSX: Bluetooth wireless dial-up Internet access (requires Bluetooth mobile phone and other devices) 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) PC: Bluetooth wireless fax (computer needs to have fax software installed) PC/for OSX: Bluetooth wireless file transfer PC/for OSX: Bluetooth wireless data synchronization PC: Support Bluetooth virtual serial port PC: Support Bluetooth wireless printing PC: Support Bluetooth headset PC /for OSX: support Bluetooth interface (Bluetooth mouse and Bluetooth keyboard) Package List: 1 * Bluetooth Adapter Note: 1. Please note that the package ONLY include a Bluetooth adapter. 2. Please allow slight error due to manual measurement. Thanks for your kind understanding. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Connected Devices(Includes all Bluetooth v 4.0/v 3.0/v 2.1/v 2.0/v 1.1 devices): 1. Bluetooth headset; 2. PDA; 3. Mobile phone; 4. Keyboard, mouse; 5. GPS positioning system; 6. Printer; 7. Laptop; 8. Other Bluetooth devices; 9. Desktop computer