Lentek MC05C MosquitoContro Plus Will repel or help keep mosquitos from biting in a surrounding area without dangerous messy creams or sprays Proven to be over 200% more effective in reducing the number of mosquito bites than citronella candles MosquitoContro is completely chemical-free and safe to use around children and family pets Knowing that impregnated mosquitos are the only ones to bite, Lentek has developed the sounds of their enemies the dragonfly & the male mosquito to keep them away. New Velcro wristband, built in belt/pocket clip. Battery life 72 hours,replaceable battery