Specifications:

• PCB Size: 37.3mm (Long) *15.5mm (wide)
  
• Weight: 3.5g
  
• Input voltage: 3.6V--6V, prohibit exceeding 7V
  
• Leads 6 feet: EN/VCC/GND/RXD/TXD/STATE (Bluetooth state leads, not connected output low level, the output high level of connection)
  
• With the connection status indicator, LED flash indicates no Bluetooth connection; Led slow flash indicates enter at command mode
  
• On-board 3.3V voltage regulator chip, input voltage DC 3.6V-6V; When not paired, current about 30mA (due to LED lights flashing, current in the state of change); After the pairing succeeds, the current is about 10m
  
• Effective transmission distance of 10 meters in open area, more than 10 meters is possible, but not to ensure the quality of the connection
  
• After pairing succeeds, can be used as a full duplex serial port. No need to understand any Bluetooth protocol, but only support 8-bit data bits, 1-bit stop bits, no parity communication format. This is also the most commonly used communication format, does not support other formats!
  
• Press the key and then power up the Bluetooth module to enter at mode, set parameters, query information
  
• Can switch host and machine mode from a command
  
• The module default baud rate is 9600, the default pairing password is 1234, the default name is HC-05