1.【Heavy Duty】This dog crate has Heavy duty steel frame, strong and durable. Constructed of metal square tube as frame and metal wire, which is even great for strong, powerful and aggressive dogs. Maximum weight capacity:660lbs ( 300KG ).1 X 6" Inline Smart Controller Duct Fan 1 X 6" Carbon Filter 1 X Grey/Black 6-inch Flexible Ducting 3 X Stainless Steel Clamps 1 X Grow Room Glasses 2 X Lifting RopesVentilation Kit Inline Duct Fan Carbon FilterEASY TO MOVE - The dog cage has 4 universal wheels for moving anywhere. You can put it indoors and outdoors. When arriving at the destination, you can lock the wheels, and the crate will stay in place even if your dog plays with itself in the cage.2.【Easy To Clean】Floor grate keeps your pet clean and dry,allows dog food or excrement to fall off. A strong pull-out tray makes the cleaning a breeze. Removable design makes cleaning more convenient.3.【Buckle Anti-collision Lock & Double-Access Doors】Double upgrade bolt locks design for anxiety dog, keep dog in contain, avoid damage or injury. The double door design is not only convenient for dog in and out but also good for you to interact with your dog.4.【Easy to Assemble】 Most of the parts were pre-assembled, fit it with four wheels and some screw bolts, only takes within 10~15 minutes to complete. UPGRADED accessory kit: one or two screws and nuts are added to prevent fittings from being lost.