The APS-055 switching power supply is designed for powering 5 VDC devices. It can be used as an external power source for SATEL wireless keypads, e.g.:

INT-KWRL2 (electronics version 3.2 or newer),
PRF-LCD-A2 (electronics version 2.2 or newer),
PRF-LCD-WRL (electronics version 2.2 or newer),
VERSA-KWRL2 (electronics version 2.2 or newer).
Nominal output voltage (according to IEC 38): 5 VDC.
Output voltage stabilization.
Output current: 0.5 A.
Input interference filter.
Electronic short-circuit protection of AC mains power supply circuit.
Electronic short-circuit and overload protection of the power output.
Mounted in in-wall and on-wall electrical junction boxes with a minimum diameter of 60 mm