One of the coolest features on our Solenoid Driver Board (SDB) that others don't have is the coil protection system. With the original board or even our competition if your coil shorts out or your system locks up, you will burn up the transistor, coil, or even the board itself. What our protection system buys you is the MOSFET's are protected by a circuit that constantly looks at the current. If the current rises to a danger point before it starts to burn things up it shuts just that coil down. Than the LED that is associated with the coil will start flashing fast to tell you that circuit is in protection mode. No damage to the board. This is again why we are the only company producing boards with a lifetime warranty.