I've never bought anything like this before so please forgive my simple questions:
1) The card has one USB and four relays. Can I control each relay on the card independently or must they all switch on and off at the same time?
2) Can I mix and match AC / DC / different voltages on different relays on the same card (ie. 240V AC on one relay, 12V DC on another, 6V DC on another etc etc)?