BUZZ OFF PORTABLE MOSQUITO REPELLENT
Powered by a single AA battery, this lipstick-size device emits a high-pitch ultrasonic noise that is nearly inaudible. Turn it on by twisting the cap, aligning marks on both parts, and clip it to a shirt or pant pocket. Some of our testers could barely hear the device when held directly next to their ears, but it was audible, though not annoying to others. The noise is touted to drive off stinging insects. We were skeptical.
TIPS: Hanging it about the waist seems to be the best compromise for covering ankles to ears. One tester clipped it to a sandal. Using two devices might work better for full coverage.
RESULTS: We were surprised. Horseflies left immediately when we fired it up and ankle-biting mosquitoes vanished when it was set by our feet.