Mega 2560 R3 REV3 ATmega2560-16AU Board USB Cable Compatible 256 KB of Which 8 KB Used by Bootloader For Arduino Eletronic Hot
https://www.vogueparade.com/shopping/EN/708022/1/1005003435904304/mega-2560-r3-rev3-atmega2560-16au-board-usb-cable-compatible-256-kb-of-which-8-kb-used-by-bootloader-for-arduino-eletronic-hot//