The Sampo PY‑Z806EL bell is a time‑displaying doorbell with adjustable date and 12/24‑hour modes, alarm settings, and a replaceable battery.
The manual explains how to set the time and date, switch between hour formats, configure the chime, replace the battery, and what to do if the unit stops working. This manual is written in Japanese.
In time display mode press the SET button and adjust the hours and minutes; the unit returns to normal display after a few seconds of inactivity.
Open the battery compartment, remove the old battery and insert a new battery of the same type; the unit will resume normal operation.