Instead of the annoying buzz of a traditional doorbell, be made aware of visitors with a loon call, a turkey gobble, or an owl hoot or even a duck quack. 10 different sounds in all. Perfect for anyone who wants to bring the sounds of nature indoors. Leave the transmitter button anywhere handy or mount to your entryway, it doesn't matter because its wireless! The transmitter runs on one A23S 12V battery (included) while the receiver runs on three AA batteries (not included). Now on sale, was originally $39.50!