DimensionEffectively protects outdoor & indoor wire connections.Include 1PC Large box(External dimensions: 12.6x8.7x5.1. Inner dimension is: 12x7.9x3.9,8 cable ports), 3PC Small(External dimensions: 8x 3.9x3.2,Inner dimension is: 5.5x3x2.2,2 cable ports) to protect outdoor power outlets, timers, extension cords, outlet plug, large adapters. Strong SealingLarge outdoor electrical box with 4 snap, 8 cable clamps, 8 rubber gaskets, small waterproof extension cord box with 2 snap, 2 cable clamps, 2 rubber gaskets, this outdoor electrical connection cord box is IP54 waterproof. Perfect for sealing 10/12/14/16AWG/3C(maximum compatibility 18mm cord) braided cable and flat cable. Luminous Safety Warning Label: The lid of the box has a luminous warning label that glows at night to prevent pets, family members from accidentally touching it, ensuring the safety of your family and pets. IP54 Waterproof and Rugged: Made of heavy-duty reinforced PP material, it is rigorously tes