| Type RF Family/Standard Protocol Modulation Frequency Data Rate (Max) Power - Output Sensitivity Memory Size Serial Interfaces GPIO Voltage - Supply Current - Receiving | TxRx + MCU Bluetooth Bluetooth v4.0 Low Energy - 2.4GHz 1Mbps 4dBm -93dBm 256kB Flash, 8kB SRAM SPI, UART 21 2 V ~ 3.6 V 22.1mA 31.6mA |