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The SM4BAT models are compact, lightweight, single channel, ultrasonic bat bioacoustics recorders. They are available in two models; full spectrum and zero crossing.
Designed around the size of four D-sized batteries, the SM4 family of recorders includes the smallest and lightest, weatherproof recorders available. Molded in polycarbonate, the SM4 is less than half the weight and size of SM3. This custom-designed enclosure allows for multiple units to be packed into a backpack. In addition to being completely weatherproof, the enclosure has an integrated and lockable security cover.
Why a single channel for bats? We found that many of our bat researchers use single channel recording for their work (e.g SM3BAT, SM2BAT/SM2BAT+ and SMZC). If you need two channels for bats, We advise that to buy two of the SM4BAT recorders. Why? The cost of two SM4BATs is not much more than the cost of an SM3BAT with an extra microphone. With two SM4BAT recorders deployed, you get more placement flexibility. Of course, you can always order the SM3BAT.
How long can you deploy an SM4BAT? Featuring a new, low-power microprocessor, single-channel recording format and running on 4 D-cell batteries, the SM4BAT FS has a recording run time of 275 to 400 hours in full-spectrum depending on bat activity - assuming a 256kHz sample rate, using SanDisk Ultra flash cards and Energizer EN95 alkaline batteries and operating with an internal temperature of 20C.
The SM4BAT ZC will record in zero-crossing even longer. Deployment times can be extended even further by using an external power source.
Note that more than half of the power consumption of the SM4BAT system can be tied to the flash cards. Run times can vary by as much as 50% depending on the characteristics of specific brands and models of cards. We recommend using SanDisk SDHC/SDXC cards and you can buy them from our store.
Other factors like the kind and quality of batteries used, how rechargeable batteries are recharged, temperature, configuration and bat activity can affect run times.
Available including or excluding SMM-U2 Microphone.
Including a 3 year warranty