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.

Note: No battery is included, you have to buy the 9V battery to use the listening device. 

Specifications:
Material: ABS
Magnification: 8
Battery: 1 * 9V lithium battery (not included)
Resolution: 11-11.5”
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
Item size: 210 * 180 mm / 8.3 * 7.1 in
Package size: 370 * 180 * 150 mm / 14.6 * 7.1 * 5.9 in
Package weight: 700 g / 1.54 l b

Package List:
1 * Binoculars
1 * Sound-collecting Plate
1 * Headphone
1 * Lens Cleaning Cloth
1 * English Manual