This bluetooth is good for adding bluetooth functionality for project. Another use you will find for this bluetooth module is with your flight management controller on your quadcopter. It should be able to be used with several of the available options, so long as the control software supports bluetooth functionality. With this module, you don't have to plug into your flight controller with a micro usb cable every time you want to tweak something, upload a new configuration, or check data. Parameters: Working frequency:2.4G Communication interface: UART 3.3V TTL level RSS I support: Not supported Communication level:3.3V Transmitting power: 4dBm Reference distance:10 meters Air speed:2Mbps Antenna interface: Built-in PCB antenna Communication cable:40mA Receiving sensitivity:-85dBm@2Mbps Status indication: When the master does not record the slave address, it flashes quickly; when it records the slave address, it flashes slowly. Slave is not connected time. After connection, both the master and the slave are blinking and stopped. Communication method(device support) 1.Connect with Bluetooth 2.0 device, one master and one slave, need to have the same pairing code and baud rate. 2.With mobile phones and laptops, you can connect with the built-in Bluetooth, or you can test through the serial port software. Note: 1.The Bluetooth signal is greatly affected by the surrounding, such as trees, metals, walls and other obstacles will have a certain Bluetooth signal absorption or shielding, we advise do not installed in the metal shell. 2.Because the metal will weaken the antenna function,we advise when you lay board for the module, the module below the antenna do not shop and alignment, it is best to hollow out. Package included: 4 * HC-06 Bluetooth ModuleApplications: The Bluetooth module is mainly used for short-range data wireless transmission,such as Bluetooth wireless data transmission,Industrial remote control, wireless LED display system, wireless data acquistion, telemetry,Traffic, underground positioning, alarm,Smart home ect. Defaults: Salve, baud rate 9600, Bluetooth name HC-06, pairing password 1234, LED status light on.Core module uses HC-06, leads from the module interface includes VCC, GND, TXD, RXD, reserve LED status output pin, the microcontroller can be judged by the foot state Bluetooth has connected KEY pin slave invalid. Small size, low power consumption,high sensitivity for send and receive; Allows your device to both send or receive the TTL data via Bluetooth technology without connecting a serial cable to your computer; Running in slave role: Pair with BT dongle and master module. Please note: iOS devices are not supported. Operating voltage: 3.3V(Note:SPP-CA Bluetooth module serial port level to 3.3V, if connect 5V level,the system needs to increase the level conversion chip.) ; Communication interface: UART 3.3V TTL level; Bluetooth version: V2.0+EDR; Signal coverage: 30ft; Storage temperature:-40℃ ~ +80℃; Led indicate Bluetooth connection status, flashing Bluetooth connectivity, lit the Bluetooth connection and open a port Backplane. Industrial serial port bluetooth, Drop-in replacement for wired serial connections, transparent usage. You can use it simply for a serial port replacement to establish connection between MCU and GPS, PC to your embedded project and etc. Computer and peripheral devices.