Based on this product's specifications, here are some alternatives and similar models
Magnetic Contact Sensor SATEL B-2T-BR — cylindrical door/window contact, tamper, brown finish
Summary description:
Cylindrical magnetic contact sensor SATEL B-2T-BR for use on doors and windows. The wired contact provides state detection and includes a tamper input for sabotage detection. Designed for discreet surface or flush mounting in a brown finish to match fittings. Suitable for intrusion alarm systems and security panels that accept conventional magnetic contacts.