Features: JDY-31 Bluetooth is based on the Bluetooth 3.0SPP design, which can support data transmission for Windows/Linux/android. With 2.4GHZ working frequency, GFSK modulation mode, and 8db maximum launch power prformance, more reliable and convenient in use. The maximum transmission distance is 30 meters. Allow the user to modify the device name, baud rate and other commands by the AT command. Easy and simple to use, this Bluetooth module can only be used as a Bluetooth slave. JDY-31 is a classic Bluetooth protocol , can communicate with a Bluetooth-enabled computer (desktop, notebook) and mobile phone (for android). Widely used in Smart-home control, Automotive ODB testing equipment, Bluetooth toy, Share mobile power, etc. Specifications: Model: JDY-31 Material: PCB version Module Size: 19.6*14.94*1.8mm/0.8*0.6*0.1in (L*W*H) Operating Frequency: 2.4GHZ Bluetooth Version: Bluetooth 3.0 SPP Communication Interface: UART STM Soldering Temperature: <260°C Operating Voltage: 1.8-3.6V (3.3V recommended) Unconnected Operating Current : 4.7mA Operating Temperature: -40 ° C ~ 80 ° C Current after BLE Connection: 7.3mA Antenna: Built-in PCB antenna Launch Power: 8db (maximum) Transmission Distance: 30m Receiving Sensitivity: -97dbm Master And Slave Support: slave Compatible: HC-05/06 SPP Maximum Throughput: 16K bytes/s (for android/windows) Scope of Application: Widely used in Android Bluetooth serial port transmission, Smart home control, Automotive ODB testing equipment, Bluetooth toy, Share mobile power, share weight scale, Medical equipment. Package list: 1 * Bluetooth Backplane 1、JDY-31 Bluetooth is based on the Bluetooth 3.0SPP design, which can support data transmission for Windows/Linux/android. 2、With 2.4GHZ working frequency, GFSK modulation mode, and 8db maximum launch power prformance, more reliable and convenient in use. 3、The maximum transmission distance is 30 meters. Allow the user to modify the device name, baud rate and other commands by the AT command. 4、Easy and simple to use, this Bluetooth module can only be used as a Bluetooth slave. 5、JDY-31 is a classic Bluetooth protocol , can communicate with a Bluetooth-enabled computer (desktop, notebook) and mobile phone (for android). Widely used in Smart-home control, Automotive ODB testing equipment, Bluetooth toy, Share mobile power, etc.