Based on this product's specifications, here are some alternatives and similar models
Door Contact Sensor KN-CA59L — No name (KN-CA59L)
Summary description:
Wired door contact sensor KN-CA59L by No name, model KN-CA59L. Designed to detect opening and closing of doors or gates, it provides a magnetic switch interface for connection to alarm systems, access control panels or automation controllers. Suitable for monitoring entry points in homes, offices and commercial premises where a basic magnetic contact is required.