Have taken with the Thailand-holiday pin. The very first evening I was attacked on the terrace and have used the pen immediately with each stitch. It was immediately, as if nothing ever since been a stitch. With the domestic mosquitoes, the unfortunately behaved differently. I do not know if I have never discovered the stitches on time or if there are stitches that are heat resistant, at least I have suffered only red spots despite a single use, often after the second time. These have been held for weeks and I had already fear that they will not go away. As the manufacturer but could wrap up warm. Itched it has continued. Too bad.