Pioneer SE-NC31C-K - Manual (Page 6)

6
En
Inserting Battery
When to replace battery
When battery becomes expended, the power indicator will
become darker, and sound will appear distorted, with greater
than normal amounts of noise. Always replace a new battery.
Nominal battery life is as follows when noise-canceling function
is used continuously:
AAA Alkaline battery: About 120 hours
AAA Manganese battery: About 60 hours
(Battery life may vary depending on surrounding temperatures
and other conditions of use.)
1 Press in direction of
arrow to open battery cover.
2 Insert battery, taking care
to align its  and 
polarities correctly.
3 Press in direction of
arrow to close battery cover.
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