The itching that their stinging causes is annoying. People give in to the temptation to scratch and this can cause skin irritation. Zanza click is an after-bite electrostimulator, which through the release of electrical micropulses, can relieve local symptoms such as itching and swelling caused by mosquito bites, thus eliminating the need to scratch. It requires no batteries or other power sources and releases no chemicals. In adults, 4/5 pulses are needed to eliminate itching, while in children over 4 years old, a half dose is sufficient.