Door Knob Covers - 4 Pack - Child Safety Cover - Child Proof Doors - Jool Baby Description Features: Deter children from opening doors or getting locked in a room with a door knob cover. Compatible with standard spherical doorknobs. Fits more door knobs than any competing product. Our door knob safety cover features a subdued, unobtrusive design that blends into your room design. Manufacturers lifetime warranty covering defects. Product Details: Product Dimensions: ‎3 x 2 x 2 inches Item model number: ‎DKC-104 Is Discontinued By Manufacturer: ‎No Number Of Items: ‎4 Batteries required: ‎No Item Weight: ‎3.52 ounces