Based on this product's specifications, here are some alternatives and similar models
Doorbell/Intercom Panel Siedle BTM650-02 Metallic Silver, dimensions 2.4 cm × 4.9 cm
Summary description:
Siedle BTM650-02 is a metallic silver doorbell/intercom panel with stated dimensions 2.4 cm × 4.9 cm. Designed for use with compatible Siedle systems, it provides a compact external interface for calling and communication at an entrance. Suitable for residential or light commercial installations where a slim, metal-finish panel is required.