Argos have got a special offer at the moment – a basic bat detector for £8. Bill has tried one and range me to say its surprisingly good. ( Most bat detectors start at around £100.) If you just want to hear what bats sound like this is £8 well spent. They are also available at Toys R us for about a pound more. Several of the bat group have bought one ( allegedly for their children) and we have been impressed. ( OK its not as good as a £200 or £1000 detector but it’s a good way to start.
go check out the page.
Once you have it, you can check out the sounds bats make with a resource from the Bat Conservation Trust. You need to register with the National Bat Monitoring programme for one of their surveys – the dawn/ dusk surveys are dead easy