This Serial Bluetooth module is an easy to use module compatible with existing Xbee socket. It is designed for transparent wireless serial connection setup. Serial port Bluetooth module is fully qualified Bluetooth V2.0+EDR (Enhanced Data Rate) 3Mbps Modulation with complete 2.4GHz radio transceiver and baseband. It uses CSR Blue core 04-External single chip Bluetooth system with CMOS technology and AFH (Adaptive Frequency Hopping Feature). Hope it will simplify your overall design/development cycle. Specification Bluetooth protocol: Bluetooth Specification v2.1 + EDR USB protocol: USB v1.1/2.0 Frequency: 2.4GHz ISM band Modulation: GFSK (Gaussian Frequency Shift Keying) Transmit power: 4dBm Class 2 Sensitivity: -84dBm at 0.1% BER Rate: 2.1Mbps (Max)/160 kbps(Asynchronous);1Mbps/1Mbps(Synchronous) Security features: Authentication and encryption Support profiles: Bluetooth serial port (master & slave) Power Supply: +3.3 VDC 50mA Operating temperature: -20 ~ +55C Features Support Bluetooth standard v2.1 + EDR. Support soft / hardware for master / slave mode setting. Through the AT command you can set the control parameters of the module and issue orders to the module. Work state instructions. Suitable for embedded serial transmission wireless alternative. On-board efficient antenna. Support connecting seven slave equipment.