Here comes a quick presentation about RFduino module.
RFduino is an Arduino compatible microcontroller, with a Bluetooth 4.0 Low Energy built-in module. It provides 7 GPIO lines, which all supports digital I/O, analog input (10 bit ADC), I2C, SPI, UART and PWM. Some shields are available: RBG Led / push button shield, USB shield (for RFduino programming), prototyping shield, servo shield, CR2032 coin battery shield, single AAA battery shield, dual AAA battery shield and relay shield.
It is powered by a Nordic 32 bit ARM Cortex-M0 processor and provides:
Electrical specifications are available on the official datasheet.
You can see on the photo below my Kickstarter reward: