The ATtiny85 AVR is a RISC-based microcontroller in an 8 pin DIP microcontroller.  The device achieves a throughput of 20 MIPS at 20 MHz and operates between 2.7-5.5 volts. The ATtiny85 is also capable of being programmed as an Arduino board using the ATtiny85 board profile and an ISP programmer.

There is more detail in our guide to using the ZZ8721 with the Arduino IDE.