1.Easy to use: This product is powered by a 9-volt (not included) battery, the effect will be better when used in an open place. Within the range, then pull the trigger to amplify the sound. The frequency can be adjusted to reduce noise, allowing your ears to easily feel the beautiful natural notes. 2.Quality material: The main part of the equipment is made of high quality plastic, which is comfortable to hold in your hand, strong in shock absorption. Take it when you are travelling, you don't have to worry about being crushed or broken. 3.Ideal equipment: This birdwatcher has a built-in 8x monocular, high-definition imaging, and an effective distance of up to 300 feet, which is very suitable for observing nature from a distance. You can use earphone to hear the surrounding sounds while viewing the scenery. 4.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.