This product is a brilliant way for the tour guide to make themselves and all the bird sounds available to everyone, great volume for the whole group to hear. The Pen links to a small but mighty Bluetooth speaker that attaches to your ruck sack, or anywhere you want it. Touch the Pen against the field guide and everyone, including the birds will hear!
 
Your set contains 1 BirdProPEN, 1 Bluetooth speaker, 1 speaker carry case, 1 field guide.