Inserta clip top means that it is easy to install. NO tools required. You just insert the hinge the pre-drilled holes, make sure that it is pushed all the way in, and then push down the clip. This will lock the hinge into place.
110 degrees is how wide the door can be opened.
1/2" overlay - This hinge will only work on a door that is 1" wider than the width of the opening it is covering and 1" taller than the height of the opening it is covering. Or in other words the door has to I/2" bigger than the opening on all 4 sides.
This hinge comes with a switch that turns on and off the soft closing mechanism. It will come with this feature enabled. If it needs to be disabled this is easily done by holding down the soft closing lever and sliding the switch to the locking position. This can be done without tools.
Pricing is per hinge. This includes the hinge plate that mounts to the cabinet and the screws to attach the hinge plate.