The extension cord safety seal is great protection for outdoor Christmas lights so they don't short out. Also good for when vacuuming your car. This product keeps your extension cord and your appliance cord securely connected and safe from water. Do not place the extension cord safety seal where it can be submerged in water. The safety seal is only water resistant if both connectors have been affixed properly and unit is clasped shut. Features - - Material: ABS. - Size: 20.00 x 6.00 x 6.00cm/ 7.86 x 2.36 x 2.36 inch. - Indoor and outdoor waterproof power cord connection box helps keep all your home electrical equipment . - No permanent installation required! The interlocking lid opens easily and molds tightly around power cords when closed. - Features a super thick, durable plastic body and weatherproof seal, for a lifetime of protection. - choice for a wide range of lawn and garden applications including holiday and landscape lights, fountains, power tools, etc. A wide range of lawn and garden. - No installation required, easily open with upper lid and , place the connection and cord properly, lock and seal. Package list: 12 x waterproof boxes