The foil wrapped tablets are a perfect way to top up your Lifesystems Plug-in Mosquito Killer unit. Each tablet will provide up to 20 nights protection, based on 10 hours use per night. Effective against Mosquitoes, midges and other biting insects. Each pack lasts up to 20 nights (10 hours per night) Each tablet treats up to 30 cubic metres Use indoors with compatible Mosquito Killer Unit Odourless Active Ingredient: Prallethrin 0.9% w/w Weight: 20g Volume: 20 tablets