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 switch trigger. the playback button to hear the sound with the free headphone. Support transcribe recordings to computers and other audio equipment. Quality Plastic material and anti-slip rubber housing. Great for studying birds and wildlife, observing their flying gestures and hearing their voice clearly. Note: No battery is included, you have to buy the 9V battery to use the listening device. Specifications: Material: Plastic Color: Black Magnification: 8 Resolution: 11-11.5 inch Field of view: 7.5° Directional listening distance: 100 meters Volume adjustment: adjustable Audio frequency range: 50-20000Hz Waveform distortion: less than 6% Sensitivity: -68dB to -50dB Recording: solid-state recording time 12s Package Contents: 1 x Telescope 1 x Sound-collecting Plate 1 x Headphone 1 x Lens Cleaning Cloth(Random color, No specification accepted) 1 x English Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.