Based on your needs, the best recorder for you is the Song Meter SM4.
Plug into an external power
source for extended deployments
or passively record birds (and other
audible wildlife) for up to 440 hours
with four (4) D alkaline or NiMH
batteries.
Capture the sounds of even distant
and quiet wildlife in stereo via two
(2) built-in, low-noise,
omnidirectional acoustic stub
microphones. Or, swap these out for
one or two (1-2) cabled
microphones (sold separately) to
deploy at distances up to 100 m
from the recorder.
Featuring a lockable weatherproof
enclosure and two (2) SD card slots
$699 USD
While the Mini 2 isn't compatible
with external power sources, it can
passively record birds (and other
audible wildlife) for up to 530
hours with eight (8) AA alkaline or
NiMH batteries.
Capture the sounds of even distant
and quiet wildlife via the built-in,
low-noise, omnidirectional acoustic
stub microphone. Add a second
acoustic stub microphone (sold
separately) to record in stereo.
The IP67-rated weatherproof
housing provides flexible mounting
options and a lockable enclosure.
$499 USD
While the Mini 2 isn't compatible with external power sources, it can passively record birds (and other audible wildlife) for up to 1,330 hours with six (6) 18650 lithium-ion batteries.
Capture the sounds of even distant
and quiet wildlife via the built-in,
low-noise, omnidirectional acoustic
stub microphone. Add a second
acoustic stub microphone (sold
separately) to record in stereo.
The IP67-rated weatherproof
housing provides flexible mounting
options and a lockable enclosure.
$599 USD