Frequency: 2402 to 2480 MHz Output power: +4dBm typ. Single power supply: 1.8 - 3.6V Single Mode Bluetooth® low energy Integrated System Clock Integrated high performance pattern antenna ARM Cortex M0 32bit processor and 256KB flash and 32KB RAM Interface: SPI, UART, I2C and 8/9/10bit ADC Outline: 5.1 x 11.3 x 1.3 mm MAX