Grandson seems to like this pretty well so far. It has blinking lights and makes noises. The instruments are good quality and fits his hands. So many different items in this set he has to use each of them a few times so it keeps his attention for awhile.

I plug my phone in the dock and voila! It couldn't be easier. I checked the accuracy at the health fair and it is very close, often right on. I keep the unit attached to my USB port and it's always ready to use.