BuzzEnder Mosquito Repelling Flameless Candle Diffuser - Keeps Mosquitos Away Safely and Effectively- University Tested!!! Multiple Uses- as soft ambient lighting Flameless Candle, as a Diffuser, or Both Scented Cartridge lasts for up to 120 hours - 1 cartridge included. 400 hours of use with 2 just batteries (not included). Could be used as a Flameless Candle and/or Diffuser. The candle light is ambient and soft. Must be used in a dark room. Safe for children and pets. Great For Camping, Patios, Porches, RV's and Around the Home. University Tested - Non Toxic, Safe & Ecologically Friendly