The iBats application for smartphones is available for the iPhone and smartphone running the Android operating system. To connect the smartphone to a bat detector a special 3.5mm audio lead is required which consists of a 3.5mm TRS plug (to bat detector) at one end and a 3.5mm TRRS plug (to smartphone) at the other (although for older ‘Android’ phone models a standard stereo 3.5mm lead may be suitable).
You can obtain a suitable lead in a number of ways:
3. Build your own! You will need a 3.5mm 3-pole plug, a 3.5mm 4-pole plug, a 0.22uF capacitor and a 4.7k resistor. And of course a length of cable and a soldering iron. The lead has been designed by Brock Craft and more information is available on his website - http://www.brockcraft.com/2010/02/24/iphone-stereo-line-in-to-mic-adapter/