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Fully Qualified Bluetooth V2.0+EDR 3Mbps Modulation
Low Power Operation
PIO control
Comes with Arduino library for easy programing
Integrated PCB antenna
Over-current protection
Baud rate can select
Auto-connect the last device on power
Permit matched device connect
Auto-reconnect in 30 min when disconnected as a result of beyond the range of connection
Easy wiring with 6 Pin RJ11 interface
Labeled with blue tag and compatible with Me–Base Shield
2.54mm breakout pins for connecting with jumper wires
16mm interval M4 mounting holes, compatible with Makeblock beams
Two on board indicator LEDs for debugging and feedback
Specification:

Power Supply: 5VDC power supply
Bluetooth Protocol: Bluetooth Specification v2.0 +EDR
Working Frequency: 2.4-2.48GHz unlicensed ISM Band
Transmission Distance: 10 meters in free space
Default Baud rate: 9600
Supported baud rate: 9600, 19200, 38400, 57600, 115200, 230400, and 460800.
Dimensions: 2.4cmx4.8cm