This is an ideal tool for observing and studying birds. 8x optical telescope combine with sound picker, you can hear voices at a distance of 100 meters and observe the birds 8 times closer. A wonderful listening device for outdoor activities. Features: 8x optical telescope with a center-focus knob allows you to view the objects closer and clearer. Parabolic sound collecting dish for hearing sound at distance of 100 meters. Comes with a headphone to reduce ambient noise. Can record up to 12s. You can adjust the volume from low to high for better hearing. Simple to operate with one hand by pulling the on/off button trigger. Press the playback button to hear the sound with the free headphone. Support transcribe recordings to computers and other audio equipment. Quality ABS material and anti-slip rubber housing. Great for studying birds and wildlife, observing their flying gestures and hearing their voice clearly.