Does it need re-zeroing when moved between rifles?

The clip-on mounts in front of the day scope, so the day scope keeps its zero. Small point-of-impact shifts can occur between hosts, so check on paper after swapping.

Can I use it as a standalone thermal scope?

No. It has no reticle or eyepiece of its own; it projects the thermal image into the day scope in front of it.

What is the detection range?

With the 35 mm lens and 384x288 sensor, expect to detect human-sized heat sources at several hundred yards, with recognition closer in. Actual range depends on conditions.

Does it record video?

Yes. It records video and captures still images to onboard storage, and can stream to a phone through the app.

What comes in the box?

The unit, a mount, a rechargeable battery, a charger and cable, and a carry case. Check the specific kit before ordering.

Which day scopes does it fit?

It fits scopes with a standard front objective and enough clearance for the adapter. Magnification on the day scope should be kept low, since high magnification degrades the thermal image.