Replacement cartridges for the Lifesystems Portable Mosquito Killer Unit. Each refill pack includes 5 cartridges, each designed to last for approximately 6 nights. Contents: 5 cartridges Treats: Approx. 30m3 Active ingredient: Transfluthrin Effective for approximately 6 nights (per cartridge) Kills biting insects when used with compatible portable unit Use for large tents, huts and hotels with compatible portable unit Portable Killer Unit available separately Weight: 0. 05g Dimensions (unpacked): 65 x 35 x 5mm