All out flash guard is repellent which neither a spray nor a liquid that needs electricity.
It is a paper based repellent, which works like a coils. Whenever required, you need to light it and it takes 2-3 minutes and keeps out all the mosquitoes.
While in use it creates a fog like coil and with a smooth fragrance it clears the mosquitoes.
You can purchase flash paper in just 10/- and one pack contains 10 paper, just tore the paper fold it half keep it on a small surface or on a table or you can take a small utensil for it and light it from centred corner. Take it to the room from where you want to clears the mosquitoes. It finishes within 2-3 minutes and clears all most all mosquitoes from that area.
Since it is a small paper, it covers a small area, to clear mosquitoes from a big hall or for an open space, I will not recommend it.
But for small room or for kitchen yes it is very effective.
I suggest, after using it with bare hands wash your hands with soap or hand wash immediately. Before hand wash do not touch any food or do not touch those hands to you eyes as it may harm. Keep it away from children.
Go FOR IT.!