Answer:
The Sewa K-W2-H operates on 433.92 MHz to communicate with Sewa wireless nurse call host displays and receiver units. Power is supplied by a 23A 12V battery (they are not included).
The Sewa K-W2-H wireless call button broadcasts over the 433.92 MHz frequency band, making it compatible with Sewa wireless nurse call corridor displays, master receiver panels, and attendant indicator consoles operating on the same frequency.
The unit requires an internal 23A 12V battery (they are not included) to deliver DC 12V operating power with an operating current draw of 10 mA, requiring no interconnecting data or power wiring back to the central console.
