The arduino -bluetooth is a microcontroller board based on The atmega328.it has 14 digital inputoutput pins (of which 6 can Be used as pwm outputs), 6 analog inputs, a 16 mhz ceramic resonator, And a reset button. It contains everything needed to support the microcontroller; Simply connect it to a computer with a usb cable or power it with a ac-to-dc adapter Or battery to get started. It has bluetooth on board so this board can be Applied to android applications and wireless applications.