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 & 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 * 1.5cm / 0.9 *0.6inFor CSR8510A10 original chip: YesBluetooth standard: V4.0 + EDR dual modeSupport Bluetooth CLASS 2: YesUSB interface: USB2.0 standard, downward compatible with 2.0/3.0 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/ME/2000/XP/2003/VISTA/WIN7/8/8.1For 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 3MbpsSensitivity < -85dBMSecurity: Built-in password and user authorizationPower: USB interface directly poweredPC/ 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/for Mac: Bluetooth wireless file transferPC/for Mac: Bluetooth wireless data synchronizationPC: Support Bluetooth virtual serial portPC: Support Bluetooth wireless printingPC: Support Bluetooth headsetPC /for Mac: support Bluetooth interface (Bluetooth mouse and Bluetooth keyboard)Package list:1 * 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/v3.0/v2.1/v2.0/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/desktop.2. Please plug in the Bluetooth adapterafter installation.