~5.25K bytes available for use (2.75K taken for the bootloader) Small enough to fit into any project, and low cost enough to use without hesitation. USB bootloader with a nice LED indicator & Micro-USB jack for power and/or USB uploading ATtiny85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM Internal oscillator runs at 8MHz, but can be doubled in software for 16MHz On-board 5.0V power regulator with 150mA output capability and ultra-low dropout. Up to 16V input, reverse-polarity protection, thermal and current-limit protection.