TETOX Mats Repel & kill Mosquitos, usually named as mosquito destroyer. Insert mat on the electric heater of the unit. Wash hands. Do not touch the electric heater unit with wet hands. plug into an electric outlet. Mat then starts emitting scented insecticide vapor lasting 10 hours. Mat blue color will turn white when exhausted. Get rid of utilized mats in dustbin. Keep out of reach of children . store in cool dark place . Install heater away from beds , curtains and air currents. Each packet contains 30 Mats impregnated with a.i. Prallethrin 10 mg / mat wt. wt. Each mat is packed in special impermeable aluminum foil easy to cut off.