Features:CSR4.0 - Adopt CSR8510 chip, which is in line with Bluetooth 4.0 technical specification and dual mode transmission.20m transmission distance - Longer transmission distance (no barrier) with strong signal.3Mbps transmission rate - More stable transmission rate, providing high-speed file and audio data transmission.USB2.0 - USB2.0 interface is more versatile.Lightweight and ultra-mini andamp portable.Fully backward compatible with Bluetooth 2.0, Bluetooth 2.1, Bluetooth 3.0 specifications.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).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 Model: BTD-401Weight: Approx. 20gSize: Approx. 2.2 x 1.5cm or 0.9 x0.6inFor CSR8510A10 original chip: YesBluetooth standard: V4.0 and EDR dual modeSupport Bluetooth CLASS 2: YesUSB interface: USB2.0 standard, downward compatible with 2.0 or 3.0 standardOperating frequency band: 2.4GHz - 2.483GHz, using FHSS (frequency hopping spread spectrum) technologyOperating range in open space: Approximately 20-50 metersIntuitive software operation interface, no complicated settings: YesApplicable to operating systems: For Windows or ME or 2000 or XP or 2003 or VISTA or WIN7 or 8 or 8.1For Windows XP SP2 or VISTA or WIN7 or 8 or 8.1, it is inevitable to drive, easy to carry! (For WIN8 or 8.1, it can be connected directly to the Bluetooth headphone speaker, other drivers need to be installed)Data transfer rate: Up to 3MbpsSensitivity andlt -85dBMSecurity: Built-in password and user authorizationPower: USB interface directly poweredPC or for Mac: 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 or for Mac: Bluetooth wireless file transferPC or for Mac: Bluetooth wireless data synchronizationPC: Support Bluetooth virtual serial portPC: Support Bluetooth wireless printingPC: Support Bluetooth headsetPC or for Mac: support Bluetooth interface (Bluetooth mouse and Bluetooth keyboard)Package list:1 x Bluetooth Adapter (NO Drive CD)Note:1. Please note that the packageONLYinclude a Bluetooth adapter. 2. Please allow slight error due to manual measurement. Thanks for your kind understanding.Connected Devices(Includes all Bluetooth v4.0 or v3.0 or v2.1 or v2.0 or v1.1 devices):1. Bluetooth headset2. PDA 3. Mobile phone 4. Keyboard, mouse 5. GPS positioning system 6. Printer 7. Laptop 8. Other Bluetooth devices 9. Desktop computerP.S. For MAC system can only be used in versions 10.2-10.84.Driver Installation:1. There are three options during the installation process: open, disable, select PC or desktop.2. Please plug in the Bluetooth adapterafter installation.