Specification:
Item Type: Bird Watching Instrument
Telescope Material: Optical Glass Lens
Product Size: Approx. 27.5 x 18.5 x 6.5cm / 10.8 x 7.3 x 2.6in
Power Supply: A 9V Battery or Carbon Battery. (shipped without batteries)
Telescope:
Effective Observation Distance: 5meters/5.5yd to Unlimitedness
Telescope Specifications: 8x21 Focusing Telescope
Resolution: 10 to 11in High Definition
Field of View: 7.5°
Directional Listening Distance: Field Quiet Environment 200meters/218.7yd, Eliminating Environmental Noise Processing
Volume Adjustment: Continuously Regulable
Return Sound Frequency Range: 20 to 20000Hz
Waveform Distortion: Less Than 4%
Sensitivity: -60 to -50dB
Select the Target Range, then Pull the Trigger​ to Hear the Amplified Sound. No Need to Install Sim Card and Sd Card, You Can Record 12 Seconds of Sound
Weight: Approx. 694g/24.5oz

How to Use:
Battery installation:
1. Use a rectangular 9V battery or carbon battery
2. Use a screwdriver​, loosen the screw and open the battery cover
3. insert a new 9V battery, connect the battery positive and negative, do not connect the reverse. The direction of the battery installation is unique
4. Close the battery cover and tighten the screw

PackageList:
1 x Bird Watching Instrument Host
1 x Headphones
1 x Sound Collection Cover
1 x Mirror Cloth
1 x User Manual

Note:
Shipped Without Battery