The Portable Mosquito Killer by Lifesystems, is a battery powered insect killer unit that can be used independently in large tents, huts and hotels where mains power is not readily available. Perfect for travel and the outdoors. The unit slowly propels an odourless scent that is harmless to humans, but extremely effective against biting insects. The unit is supplied with a single cartridge that provides up to 7 nights* protection. Replacements tablets can be bought separately.It repels: mosquitoes, midges and other biting insects.The unit requires 2 AA batteries which will also last approximately 7 nights.Active ingredient(s): 45.1% Transfluthrin.