Pettersson Elektronik, D500X Ultrasound Detector/Recorder
The 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 recording as a sound is detected.

More info in : http://www.batsound.com/?p=10
 
Wildlife Acoustics- Song Meter SM3
The Song Meter SM3 acoustic recorder is a multi-role bioacoustics recording device that can simultaneously record any combination of avian, terrestrial and/or marine life. Completely ruggedized, quick to configure and highly customizable from a configuration and scheduling basis, the SM3 can perform a wide variety of recording roles, and remain in the field for extended periods of time.

More info in : https://www.wildlifeacoustics.com/products/song-meter-sm3