Specifications:_x005F_x000D__x005F_x000D_1. It is HC-05._x005F_x000D__x005F_x000D_2. Use the CSR mainstream bluetooth chip, bluetooth V2.0 protocol standards. _x005F_x000D__x005F_x000D_3. Module working voltage 3.3 V. _x005F_x000D__x005F_x000D_4. Potter default rate of 9600, the user can be set up. _x005F_x000D__x005F_x000D_5. The core module size : 28 mm x 15 mm x 2.35 mm. _x005F_x000D__x005F_x000D_6. Working current: matching for 30 MA, matching the communication for 8 MA. _x005F_x000D__x005F_x000D_7. Dormancy current: no dormancy. _x005F_x000D__x005F_x000D_8. Used for GPS navigation system, water and electricity gas meter reading system. _x005F_x000D__x005F_x000D_9. With computer and bluetooth bluetooth adapter, PDA, seamless connection equipment_x005F_x000D__x005F_x000D_Commercial Series: Bluetooth module board Series_x005F_x000D__x005F_x000D_With LED indicator light, use 150mA and 3.3V regulation chip._x005F_x000D__x005F_x000D_With VCC.GND.TXD.RXD foot for the Bluetooth_x005F_x000D__x005F_x000D_With "Re-seach" button(ON/OFF/WAKE foot for it , external MCU outinput "High level" can control module to re-seach)_x005F_x000D__x005F_x000D_Compatible with bluetooth master module".slave module"or master-slave(whole) module._x005F_x000D__x005F_x000D_Input voltage: 3.3~6V_x005F_x000D__x005F_x000D_Note:_x005F_x000D__x005F_x000D_Input power supply 3.3~6V, Prohibit more than 7V_x005F_x000D__x005F_x000D_No "Automatically prevent power supply peversing func", so please correctly connect power supply _x005F_x000D__x005F_x000D_We advise to install "Bluetooth master module" _x005F_x000D__x005F_x000D_The "State" is output foot for LED status, when bluetooth "Unconnected", output "Pulse" ; when bluetooth "connected", output "High level", we can determine the states from "MCU" _x005F_x000D__x005F_x000D_If only the board , No any "Bluetooth Function _x005F_x000D__x005F_x000D_The package includes:_x005F_x000D__x005F_x000D_1 * hc-05 module_x005F_x000D__x005F_x000D_