You can already do plenty of things with an iPhone. With the Echo Meter Touch 2, you can turn your smartphone into a bat detector. The device lets you record bat echolocations in real-time and uses smart algorithms to identify the two species that match closely.
You can transfer recordings to your computer over WiFi. The app saves the location of each recording, so you can view it on a map. The Echo Meter is compatible with iPhone and iPad. The unit records 16-bit full-spectrum WAVE at 256kHz sample rate. It runs up to 13 hours on an iPad and up to 4 hours on an iPhone.