Whether you're going for a quick jog at the local park or camping out for the weekend, you'll be grateful to have this mosquito repellent at your side—it clips to your belt or pocket for convenient portability. The device emits a noise that is harmless to humans and animals, but deters mosquitoes at an effective range of approximately 129 sq. ft. It contains no chemicals, so you can feel confident about carrying it near you for as long as you need. Features up to 800 hours of battery life and requires 1 AAA battery (not included). Measures 1-3/4" x 2-3/8" x 1".