This thermal-based patch delivers total body protection against mosquitoes, no-see-ums, black flies, yellow flies, and ticks without the smell or mess of sprays! Each patch contains 50 mg of Thiamin B1 that is absorbed through the skin and then released through your pores for maximum effectiveness. Adults and children over 80 lbs. should use 1 to 2 patches every 48 hours. Box of 50 pouches (2 patches per pouch).