RadioShack Arduino Mega 2560 REV3

Catalog #: 2760127

$64.99

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Powered via USB connection or external power supply - with power source selected automatically
External (non-USB) power from AC-to-DC adapter (wall-wart) or battery
Operates on an external supply of 6 to 20 volts (7-12V recommended)

256KB flash memory for storing code (of which 8KB is used for the bootloader)
8KB SRAM
4KB EEPROM

54 digital pins that can be used as an input or output
16 analog inputs, each of which provides 10 bits of resolution (i.e. 1024 different values)

Max PCB length and width of 4 and 2.1 inches
USB connector and power jack extend beyond PCB