4 switch modes can control in and out of fashion by setting the button, thus you dont need to worry about the safety of pet. It is very easy to install that you just need to tighten the screws and ensure its stability. Made of ABS, It is very durable and solid to use. There are three sizes for choice. It is very suitable for pet, including dog, cats, rabbits, etc. Size Details: S (Exterior Size) : 20cm x 1 9.2cm x 1.5cm/ 7.87in x 7.56in x 0.59in (Approx.) S (Inner Size): 16cm x 1 5.7cm/ 6.30in x 6.18in (Approx.) M (Exterior Size) : 20cm x 1 9.2cm x 5.5cm/ 7.87in x 7.56in x 2.17in (Approx.) M (Inner Size): 16cm x 1 5.7cm/ 6.30in x 6.18in (Approx.) L (Exterior Size) : 25cm x 2 3.5cm x 5.5cm/ 9.84in x 9.25in x 2.17in (Approx.) L (Inner Size): 19cm x 18cm/ 7.48in x 7.09in (Approx.) XL (Exterior Size) : 22cm x 25cm x 5.5cm (Approx.) XL (Inner Size): 22cm x 20cm (Approx.) Size:S, M, L, XL(optional) Color:Black, White(optional) Package List: 1 x Cat Door 1 x A set of mounting screw About shlpping: All items will be shlpped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we'll make you feel satisfied.