Based on this product's specifications, here are some alternatives and similar models
Wireless Entry Indicator CEE GB212 — wireless door/window entry sensor, model GB212
Summary description:
CEE GB212 is a wireless entry indicator designed to detect and report door or window open/close status. As model GB212, it connects wirelessly to compatible control systems to signal entry events. Suitable for use in residential or commercial installations, it provides remote monitoring of access points and integration with alarm or automation setups.