| 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 v4.1 Low Energy - 2.4GHz 3.69Mbaud 9dBm -94dBm 64kB RAM, 64kB ROM I²C, SPI, UART 15 1.2 V ~ 3.6 V 20mA 18mA |