1 X Click Mosquito Bite Relief Device Blue

I'm confused(not an abnormal state for me, btw) how many times can you use this item? the way i took it was once. am i way off base? so confused! dawn

How is this charged if there are no batteries?

I've heard that people can use it for headache and muscle tension relief as well. Anyone know how to do that?

Does this get rid of the bite as well or just the itching?