Well over half of the birds observed during an typical outing are first heard and then hopefully seen. Birding experiences therefore are much more rewarding when one is familiar with bird songs and calls. Using advanced digital technology, IdentiFlyer Ultra features 120 bird songs and 10 frog calls. Songs can be quickly sorted by region using a switch or one can select "all." Comes complete with two AA batteries, belt clip and wrist strap. Fits easily into the palm of your hand (measures 3" x 7" x 2"). Volume controls allow for quiet listening if birds are nearby. Comes with complete operating instructions.