Foil-wrapped mats complement your Plug-in Mosquito repellent. A pack of 10 Mats provides up to 10 nights of protection (4 hours per night for each mat). DEET-free, no sprays or lotions on your skin. Experience maximum defense in 50 seconds. Our Mosquito Repellent Mat is independently tested, the core ingredients are Prallethrin and Meperfluthrin, and SDS-certified for safety & effectiveness.