Repels and controls house flies, stable flies, horn flies, face flies, horse flies, deer flies, mosquitoes and gnats on horses. Repels multiple species for 3 to 5 days using only 1 spray application on the first day.A long lasting, water based fly spray that contains 0.10% pyrethin, 1.0% piperonyl butoxide and 0.10% permethrin and the added fragrance of citronella.