D500X Ultrasound Detector/Recorder Shirts This series of small transmitters

This series of small transmitters is designed for glue-on application to bats

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Comes standard with a dual battery system that lets you use traditional AA batteries or a rechargeable NiMH power pack

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Kestrel 5500 measures:

D500X Ultrasound Detector/Recorder Shirts This series of small transmittersThe D500X is an ultrasound recording unit intended for long term, unattended recording of bat calls. In contrast to time expansion bat detectors, the D500X records full spectrum ultrasound in real time with virtually no gaps between recordings. The recorder is equipped with four slots for CF cards, which typically makes it possible to leave the unit in the field for more than a month. The triggering system allows the device to automatically start