Send biting insects the "Stay Away" message with Bite Shield?. Bite shield is a portable, lightweight biting insect repellent. It uses repellent beads that produce a scent biting insects hate but is pleasant to humans. The repellent cartridge contains plastic beads made with a naturally occuring oil called Geraniol. Geraniol is a compound extracted from common plants such as lemongrass. It is effective to repel mosquitos, no-see-ums, flies and more! Slide one of the replaceable repellent cartridges into place, turn it on and stop worrying about those biting insects. The super quiet fan distributes the scented repellent to protect you from biting insects. Specifications 15 feet of outdoor coverage Up to 2000 Square Feet of indoor coverage University Tested Clips on belt or Place on any flat surface Natural - No Chemicals Safe Repels: Mosquitos, No-See-Ums, Flies and more!