Pretty, I found that the hand pump insect repellent system is the best for me.
I have old lady "carpal tunnel" wrists so can't really hold heavy things over my head for an extended period of time. Using this, the wand does the height.
Also, I have tried both the battery powered and human powered mist bottles and in both cases, I found that they had a tendency to drip. Some water didn't get sent to the misting nozzle, it ran down my arm. That has not been a problem with this system. I think I paid $15 at Walmart.