Based on this product's specifications, here are some alternatives and similar models
Reed switch door/window sensor bleBox reelswitch – magnetic contact sensor for open/closed state monitoring
Summary description:
bleBox reelswitch is a reed switch magnetic contact sensor designed to detect open and closed states of doors or windows. The simple magnetic sensor provides a binary contact signal for integration with home automation or alarm systems. It is suitable for monitoring access points, triggering automations, or adding basic security status reporting.