Based on this product's specifications, here are some alternatives and similar models
Door Push Button Grothe 62002 — Aluminium, 24 V, 1.5 A
Summary description:
Grothe 62002 is a push button for door and access systems with an aluminium housing. Rated for 24 V and 1.5 A, it provides a compact manual control point for intercoms, door releases or access control circuits. The robust metal construction suits indoor or sheltered outdoor installation and allows straightforward wiring to compatible 24 V systems.