Specifications:Type: Mosquito Repellent Tablet(not included heater )Material: PaperColor: as shownSize: 3.5*2.1*0.1cmChlorfluthrin content: 4mg/pcShelf Life: 2 yearsFeatures:This product is an electric heating mosquito repellent tablet formulated with chlorofluthrin, each tablet canbe used for 12 hours, and 120 tablets will provide you and your family with 120 nights (12 hours per night) mosquito repellent care.Directions for use:1.The electric mosquito repeller horizontally, then insert one piece of mat in the repeller.2.Plug electric mosquito repeller into the electric outlet.3.Open windows or open door while use for better ventilation.Package Included:1/20/40/60/80/100/120PCS x Mosquito Repellent Tablet