Mortein LED offers 100% continuous protection from dengue/malaria mosquitoes. It’s TFT formula starts working in 5 minutes and the liquid vaporizer refill lasts for 30 nights on approved use of 8 hours per night. Starts protection from mosquitoes in 5 minutes under test conditions based on 100% landing and biting inhibition against dengue/malaria mosquitoes after 35 minutes of product exposure under standard test conditions.