1.Special design and function: Its built-in monocular is great for spotting animals from afar or for watching at the slightest details of smaller animals. It comes with a 3.5mm headphone jack. The sound amplifier also comes with its own pair of headphones. 2.lasting : The outdoor gadget features a design. It is furthermore powered by a 9V battery (not included). This battery brings along enough power to get you through the day. 3.Long Distance Listening: With this outdoor gadget, you can hear sounds up to 300ft/100m away. This makes it the perfect outdoor gadget to observe nature without disturbing the animals. 4.For Bird Watching: 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.