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The Integrated Field Recorder (IFR) IV developed for extended duration monitoring projects.
Built in networking capability for remote download & device monitoring.


The iFR-IV is an integrated field recording system developed for overnight and extended duration monitoring projects.  Drawing just 3.2 Watts, the iFR-IV is Binary Acoustic Technologies lowest power recording solution. It is capable of recording up to three days using the internal battery and up to two weeks using a small 40 Ah external car battery.

A complete monitoring system can be assembled using a minimum of components. A typical overnight recording system consists of an iFR-IV Field Recorder along with an ultrasonic microphone.  The system can also be reconfigured into a extended duration recording system by adding, a USB hard drive, and a solar panel.

The iFR-IV is a fully weather proof system built into a small Pelican case. It includes an integrated battery system, an embedded microcontroller, a high speed 16-bit digitizing system and two USB connectors which allow it to control and operate an ultrasonic microphone along with a combination of  external USB hard-drives, Compact Flash writers, or USB thumb-drives for storage.

Internally, the iFR-IV runs an embedded version of SPECTÕR software.  It supports an operation timer, the WAVPACK loss-less compressed file format, sleep mode to conserve battery power, a file scrubber to reduce noise-only files, and a remote file transfer mode that will automatic transfer recordings back to a specified FTP site.

The iFR-IV operates using Binary Acoustic Technologies EXT ultrasonic microphone units. The microphone interface supports cable lengths of up to 250 feet.


How it works

Connect the EXT microphone and plug in the optional LCD controller to the USB1 port. Plug in a storage device (card reader) into the USB2 slot. Upon booting the iFR-IV, the typical settings should be reviewed, such as date, time, trigger setting, and timer options. You can also enter custom filenames and even SonoBat compatible metadata notes about your sampling location.

Unplug the LCD controller and the iFR-IV sleeps until the next programmed monitoring event occurs. A log file is written to your storage media along with SonoBat compatible .wav files.

The iFR-IV is best at:

  • Overnight or longer duration unattended recording
  • Situations where very long cable runs are required
  • Built in networking; suitable for deployments where you would like to remotely access the data

iFR-IV Specifications:

  • 250 kHz sampling rate
  • Full Spectrum recording
  • Loss-less file compressor
  • Supports most USB storage devices
  • Operation timer for unattended operation
  • Sleep mode to conserve battery power
  • Automated snapshot recording mode
  • Sonobat file compatibility
  • Built-in file scrubber
  • Built-in remote file transfer capability
  • High speed USB 2.0 interface
  • Pocket-sized, durable aluminum enclosure
  • Weatherproof
  • Power Requirements : +12V @ 3.2W (typ.)


  • Two (2) USB ports
  • One (1) Ethernet connector
  • One (1) RS-232 console connector
  • One (1) EXT MIC connector
  • One (1) 12V power barrel connector

Compatible Accessories:

  • AirLink Raven-X cellular modem
  • AR125 Ultrasonic Receiver
  • Blue Icicle XLR microphone interface
  • LCD Controller

Storage (user provided):

  • USB2 Thumb-drives
  • USB2 Compact Flash writer
  • USB2 enabled external hard drives

Download iFR-IV User Manual

Why BCM can sell the iFR-IV:
We used it ourselves for two seasons BEFORE offering it to our customers, and are confident that it returns faithful representations of bat echolocation calls.


BCM and Janet Tyburec Consulting have set up quite a few side-by-side tests over the years now, perhaps our most ambitious testing was a paired deployment of seven different full-spectrum microphone/detector combinations.Detectors included a Pettersson D500x and D1000x, Wildlife Acoustics SMX-US and SMX-UT and EM3, and Binary Acoustics AR-125 and IFR-IV. All at a location where the SonoBat 3.2.0 US West classifier included every species documented for the area.

Once again, microphones and/or detectors were elevated at the tops of 5-meter poles.They were deployed as closely as possible to each other to cover a similar airspace. All were in an open habitat, on a ridge above a lava tube cave that served as both a day roost and night roost as well as watering source in this otherwise arid environment. All microphones were oriented horizontally to cover the airspace both above and below the microphone. Due to limitations in power and storage on some detectors, the trial could only be conducted for a single night.

As usual as we have found in our trials, the SMX-US mic retuned the most recordings. And, inexplicably yet again, the SMX-UT (and EM3, which shares similar technology) returned among the least. The Pettersson units and the Binary Acoustics iFR-IV were in the middle.

Yet, again, when it came to the number of recordings that could be confidently identified, the Pettersson units came out on top, followed by the iFR-IV from Binary Acoustics, and trailed by the Wildlife Acoustics models.


Occupancy results were affected by very low sample sizes for most species.

Even so, the Pettersson detectors retuned the greatest species diversity for this single night survey.

And (perhaps more significantly), as surrogates for the Myotis species of interest in the northeast and east (areas heavily affected by WNS which prompted the USF&WS switch from a capture protocol to an acoustic protocol for determining species presence), it is interesting, significant, and important to note that the Pettersson microphones consistently retuned the greatest species diversity of bats from the Myotis guild as well as the greatest numbers of recordings for these species.


Confused about acoustic monitoring for bats?

Acoustic monitoring is more complicated than it appears. How do you know if what you are recording is any good, if you don't know what it's supposed to sound like in the first place? Please see our acoustic help section particularly for placement and weatherproofing suggestion. BCM also offers highly rated workshops of various lengths around the country for those wishing to jumpstart their learning curve. We also offer professional services ranging from managing your acoustic data for you to complete project management; contact John Chenger for quotes.

A note about placement and
weatherproofing the BAT iFR-IV



Dedicated Long Term Passive Monitoring

w/ remote access


iFR-IV Pricing

Includes EXT directional microphone, 10' mic cable, power adapter, manual.

In Stock

$2,195.00 elitesilver001praddtocart2bviewcart

BATLCDCOntrollerLCD Controller

To program an iFR-IV in the field, it is handy to have this LCD controller. This controller allows all the iFR-IV settings to be modified. One controller can be used with all your iFR-IV units.


In Stock

$150.00 elitesilver001praddtocart2b1

ammobox1Storage/Travel/Short Term Deployment Case
Storing bat detectors is usually not a problem; it's what to do with the myriad of "other things" you find indispensable that need to be in ne place for convenience for your surveys. Intended to hold an iFR-IV, 50' mic cable, the microphone, associated power adapter/chargers, and an assortment of rubberbands, brackets, and guy ties for mounting you microphone to things. We have cut a small groove in the lid for you so the mic cable can exit. Plastic, weather resistant, lightweight construction and stackable. Note: since the iFR-IV is built into a pelican case itself, it is already quite weatherproof; so this case is more for storing the cable/mic/device in one place.

In Stock

$38.00 elitesilver001praddtocart2b1a1a1a1

Bat Conservation and Management, Inc. ¥ Carlisle, Pennsylvania ¥ (717) 241-ABAT

BCM Returns Policy


BAT MiniMic

Conceived at the April 1, 2013 Western Bat Working Group Meeting, BCM received the first two prototype miniMic devices just a few weeks later in time for a full summer of testing. The D500X is a USB driven full spectrum ultrasound microphone intended for live view active monitoring, mobile transects, and short term unattended (passive) monitoring of bat and other high frequency animal calls. The miniMIC is specifically designed for applications such as bat recording and vocalization analysis where wide spatial coverage and a wide ultrasonic frequency range are desired. It employs low noise circuitry along with 16-bit digital converters to achieve high sensitivity along with a large dynamic range. It is capable of detecting bats at a distances up to one hundred and forty feet.

General MiniMIC Features:

MiniMIC is better suited for:

iFR-IV Accessories