Sony WRT-810A Operating Instructions Manual page 14

* After entering attenuation display/set mode by pressing the SET
button in channel set mode, if you do not press any button for about
five seconds, the unit will return to channel set mode automatically.
e Even if you keep on pressing the + or — button, the input attenuation
setting does not cycle. After being decremented to O dB or
incremented to 21 dB, the setting stays unchanged unless you
change it in the reverse direction.
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