45ML*2 -Liquid-Formula Shieldtox act to repel mosquitoes in 10 minutes. -Protection for 60 nights of mosquitoes if used 8 hours per night. Terms of Use: -Open Shieldtox Liquid bottle. Place the bottle into the heater and put the Liquid Shieildtox switch. Bottle of Shieldtox Liquid effectively repel mosquitoes for 480 hours for a room size of 60m3 which is equivalent to 60 nights if used for 8 hours overnight. Switch off the heater when not in use.