1. Container pieces used in all sense 10ppm crystal high-progress so the module to achieve excellent performance and minimal volume. 2. Module open transmission distance of 50~80m indoor 10~15m depending on the environment is different for reference only. Usage: Mouse keyboard wireless headsets intelligent sports equipment remote control devices voice applications safety devices VOIP applications toys smart home wireless sensing security alarm close to the high-speed data transmission other short-range wireless applications Caution: 1. Module with SPI interface to communicate with an external microcontroller via SPI and modules to complete the configuration register and read send and receive wireless data. 2. Module supply voltage must be 1.9~3.6V 5V MCU IO If you use the drive please 1K resistor in series to avoid damage. 3. Near the antenna do not place a significant effect on the antenna metal objects; modules placed in sealed metal case the distance will be greatly reduced. 4. Requires at least two of the modules to communicate with each other.