We have now released an iBats app which allows a smartphone to be directly connected to the ultrasonic detector and the geo-referenced sound files can then be automatically uploaded onto the ibats website, this replacing the need for a separate recording device, GPS and recording form. the app is availble for free! You can view instructions to use the iPhone app for the iBats project by downloading the iPhone survey protocl from the Survey Protocols page.
You will need a special recording lead (male-male TRS to TRRS jack) to connect these smartphones to the bat detector. See the guide to obtaining/building a lead.