Here is a pair of thermal binoculars with WiFi that lets you see clearly in complete darkness. The Accolade XQ38F has a magnification range of 3.1 to 12.4x. You will be able to use these to detect man-size heat signatures up to 1475 yards away.
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The battery lasts up to 8 hours in WiFi mode. Here are the specs:
- 384×288 resolution, 17µm pixel thermal imaging sensor
- digital zoom
- 1475-yard detection range
- video recorder
- field of view of 9.8 degrees
- refresh rate 50 Hz
- Live internet video sharing
- IPX7 waterproof
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