Ideal equipment: The sound detecting system is powerful enough to monitor conversations up to 300 meters away Handheld parabolic sound dish. Hear sounds up to 300ft, Adjustable sensitivity dial. Special design and function: Ideal for bird watching and observing wildlife. Designed with a powerful optical zoom viewfinder function with a magnification of 8x, you are able to follow objects optically with no need of using extra monoculars. Easy to use: Lightweight and running on a 9V battery (not included in delivery), easy to carry from place to place. Built in 8x magnification monocular. Fain bird songs are readily detected. lasting Durable: Its built-in monocular is great for spotting animals from afar or for watching at the slightest details of smaller animals. 3.5mm Jack for headphones (includes headphones). External recorder can be attached through 3.5mm Jack. Multiple functions: This sound amplifier is capable of recording 12 seconds and noise at once. It also comes with instant playback features. This allows you to fully observe and analyze the animals in your surroundings.