There's no ATTiny45 in this product...however, you can use an ATTiny45 to control a string of ShiftBrites by setting up the Data, Clock, and Latch pins in the same way you'd output to a string of 74HC595 shift registers (there should be plenty of wiring and code examples on the internet). I'll put some AVR example code up later; the Arduino code on the product page gets you pretty close.