2.1mm power jack
    Optiboot bootloader (Uno setting)
    ATmega328 Chip
    L4931CZ50-AP TO-92 low dropout regulator (300 mA)
    Note: Regulators such as MC7805CT-BP , LM2940 , or other TO-220 1A regulators make great alternatives if you need more power on your breadboard.
    We now also have these available with 3.3v regulators (L493133)