Contents: this set contains three packs of BG-Sweetscent which can be used for the BG mosquitars and the BG-Home and other mosquito traps - one packet is used per trap. Effect: The attractant developed and patented in Germany imitates the human skin fragrance from which the tiger mosquitoes are attracted - the ingredients are also non-toxic. Can be used in combination with the Biogents mosquito traps, the BG-Mosquitaire and the BG-Mosquitaire CO2 and the BG-Home, and also other standard mosquito traps. Refill: this package works in a trap for two months and then it needs to be replaced. The pack of 3 is therefore ideal for mosquito control for a whole season (6 months).