Zoom H4n Pro Operation Manual page 16

The H4n Pro can be powered by a standard power outlet or batteries.
ZOOM AD-14A/D
015
Install two AA batteries.
1
open the battery compartment cover or
connect/disconnect the AC adapter. Failure to
do so could damage recording data.
2
(Follow the +/– orientation.)
3
: Ordinary use
(using AC adapter or batteries)
ON: STAMINA mode on
(conserves power when using batteries)
4
Stamina mode explanation
P.035