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This . ounce, thumbnail-sized device plugs into a smartphone's charging port and delivers a calculated pulse of heat that stops bug bites from itching--sometimes for good. It's controlled by a free downloadable app that lets users adjust the heat's intensity and duration, and testers agree: It actually works.

The smallest gifts are sometimes the most useful. Snag one of these three-ounce-or-less upgrades for the hiker on your list.