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 aiming 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 2.8X Monocular: parabolic microphone monoculars design is very attractive, and the 8x monocular telescope allows you to see objects clearly at close range. The ergonomically designed handle can be easily operated with one hand only by pulling the on/off trigger. You can adjust the volume from low to high to get better hearing. 3.Ideal equipment: With this outdoor birdwatcher 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.Application: Sound mobile device which acts as a bionic ear. Design for outdoor hunting, sporting or all entertainment venues. Bird watchers and nature lovers will be thrilled at the sound quality of this ingenious listening device.