In short!
This racket is very effective against small insects: flies, wasps, horseflies, mosquitoes, moths, spiders. I also tested with a big hornet. The Hornet was shaken well, but it has not killed (they are very resistant insects).
I chose this model because it had no plastic structure in the center. These structures (probably designed to avoid touching a person by accident) reduce the active surface against insects and causes the higher air resistance.
The size of the handle and of the racket is perfect (for my big hands, anyway;)
I tested the discharge with fingers. It's not really dangerous but it gives a good chestnut still (somewhat like an electric fence). It is essential to avoid playing with (attention to children) for a discharge on the head must be really painful, even dangerous. For normal use, there is no risk.
I immediately put rechargeable AA batteries, and fairly regularly using the racket for a month, I have not yet had to recharge them.
I bought two because I have a big house in the countryside. I pays for the evening my visiting friends. They thought it was great to clean the room mosquitoes before going to bed.
As I intend to do a rural house, I will buy others.
ATTENTION all the same, all the insects are not harmful and they contribute to the balance of natural environments, gardens and vegetable gardens. Very few are really dangerous to humans. Often they serve as food for other animals. Some destroy them. Be eco-friendly and do not systematically kill anything that flies or wanders over 4 legs !!!!