Description 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: PlasticColor: BlackMagnification: 8Resolution: 11-11.5 inchField of view: 7.5Directional listening distance: 100 metersVolume adjustment: adjustableAudio frequency range: 50-20000HzWaveform distortion: less than 6%Sensitivity: -68dB to -50dBRecording: solid-state recording time 12sPackage Contents:1 x Telescope1 x Sound-collecting Plate1 x Headphone1 x Lens Cleaning Cloth(Random color, No specification accepted)1 x English ManualOnly 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.