1.8X Monocular with Parabolic Microphone Design The device combines a parabolic microphone with an 8x monocular telescope to help you see objects clearly at close range. The ergonomic handle supports one-handed operation with an on/off trigger. You can adjust the volume from low to high to improve hearing. Ideal equipment for outdoor observation Observe nature without disturbing animals. This device allows you to hear sounds up to 300ft/100m away, making passive listening practical in the field. Special design and function Parabolic sound collecting dish provides a bionic ear style listening aid. Built-in monocular is great for spotting animals from afar or examining the details of smaller animals. It includes a 3.5mm headphone jack to avoid disturbing your surroundings, and the sound amplifier comes with its own pair of headphones. Easy to use powered by a 9-volt battery (not included). For best results, use in an open area. Pull the trigger within range to amplify the sound. The frequency can be adjusted to reduce noise, helping you hear the natural notes more clearly.