Weather-resistant plastic. Barrier locking system. Dog door is operated by an infra-red collar key. 4 locking options - in only, out only, opened, locked. Suitable for dogs up to 45kg. Suitable for wooden, PVC and metal doors. Can also be fitted into bricks. Overall size (H)56.1, (W)45.6cm. Door size (H)42.9, (W)29.1cm. Manufacturer's guarantee of 3 years.