About Listening Device
Believe it or not, in a controlled environment, the human ear can pick up sounds as delicate as the sound of blood coursing through the head. But, since life rarely takes place in a controlled environment, you can rely on a listening device to amplify sounds that always seem to fall beyond earshot. Some electronic listening devices use padded headphones and sound catchers to gather noise from distances spanning over 300 feet. Nature enthusiasts can catch every chirp and hiss as they make their way through wooded areas. Sports fans can listen to every call of the umpire or dissatisfied mumble from the dugout. Of course, if you want to take on the role of a spy, miniature listening devices serve as important tools. If something is happening in the next room that you really must hear, a wall listening device makes muffled voices and sounds clearer. Find the right listening device in the vast inventory on eBay and you can stay in the loop — whether you are observing nature outdoors or playing spy games around the house.