This dual action flea control is exclusive to the pet trade and is now part of the award winning 4fleas range. Kills on contact, no need for fleas to bite. Our fastest acting Spot-on. Stops fleas biting in 3 - 5 minutes. Kills flea larvae within 20 minutes of contact in the area around your pet, including their bedding, resting areas etc. Kill 98% - 100% of fleas within 12 hours.