This project is my second design with snowy owl. It is a bit bigger than Purple Snowy. It has a CR2032 battery and a butterfly clutch on the back. You can wear it and it blinks its eyes. Get it here at Tindie, <a target="_blank" rel="noopener noreferrer" href="http://www.tindie.com/products/nwmaker/snowyowl2/">www.tindie.com/products/nwmaker/snowyowl2/</a> It comes with two different colors, white or purple soldermask. It uses a dual inverter NL27WZ04 to drive the blinking of LEDs. This chip is not often used or mentioned for ring oscillator.<br><br>Check all the documents here: <a target="_blank" rel="noopener noreferrer" href="https://github.com/nwmaker/PurpleSnowy">https://github.com/nwmaker/PurpleSnowy</a> <br>