USB-ISO is galvano isolator of your PC USB port with 1000VDC isolation. It’s must have device if you deal with Arduino prototype boards as in case you wired something wrong you can burn your PC or laptop USB port. USB-ISO will protect it. Also lot of people use USB-ISO for Audio DAC ground loop isolation.
To participate in the Quiz is enough to Re-tweet the Twitter Quiz announcement message.
To double your chances you have to answer the Quiz question
Today we will post on Twitter our question.
You have time to re-tweet until Monday 7th of July.
In Monday we will count the correct answers and ask random.org to generate random number in range then announce the winner and ship the board by airmail.