Bonus 25% more than the 15 oz size. Kills by contact. Kills for up to 4 weeks (Against mosquitoes and houseflies on non-porous surfaces). Kills houseflies, mosquitoes & other listed insects. Water based. Guaranteed to work or your money back. www.hotshot.com. Questions or comments? Call 1-800-917-5431 or visit our website at www.hotshot.com. No CFCs: Contains or other ozone depleting substances. Federal regulations prohibit CFC propellants in aerosols.