The BATZ has been specifically designed for the younger user, but it is still a fully
functioning heterodyne detector covering frequencies from 18 to 120 kHz. It has a
built in LED torch and integrated speaker to allow group listening. It also has a
headphone jack to allow connection of a pair of headphones. It comes with a full
colour booklet introducing Rick Batty our helpful cartoon bat who explains a variety
of facts about bats in a simple and fun format. Requires a 9v battery which is not
included with the device.