Diamond Group (WDR15WT) White Speed Box Receptacle with Cover (Quantity 4) Includes White Snap On Wall Plate. Receptacles are self-contained, completely insulated and do not require a separate outlet box. 15 AMP, 120 Volt AC. Devices secure to the wall surface with two self-ranging pawls and are ideal for factory built and transit applications where vibration-resistance is especially important.