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By certification 
FSC-BT405:
Product Describe:
The 405 is a Bluetooth module based on CSR BC04 External chipset with an antenna integrated. It is Class1 BT module. When used with the CSR Bluetooth software stack, it provides a fully compliant bluetooth system to v2.1 of the bluetooth specification for data and voice communications.
Feature:
Bluetooth Class 1（>100M）
Enhanced Data Rate (EDR) compliant with V2.1
Full Speed Bluetooth Operation with full Piconet and Scatternet support
Low power 1.8-3.6V operation (3.3 default)
UART, PCM interface
Application:
Measurement and monitoring systems
Industrial sensors and controls
Personal Digital Assistants(PDAs)
Computer Accessories
Access Points
Digital Cameras
