As scientists have used bat detectors to listen to rats, I thought I would try to build my own. A bat detector is a piece of equipment which detects ultrasonic noises and then converts these noises into something that we can hear. By using a detector you can find out if bats are nearby.
They have a limited range of around 25 to 30 meters. Many bat detectors are able to detect a range of ultrasonic frequencies. When using them with rats, they work best within a couple of feet, as bats are far louder and generally bigger than rats. Using a bat detector inside can also be problematic as electrical appliances create lots of ultrasonic background noise.
http://bclee.net/ratdet.html
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