DJI
246 g camera drone with a 3-axis gimbal and a 10 km link. Under the 250 g line, so recreational flying needs no FAA registration.
The Mini 4K exists because of a number: 246 g. Staying under 250 g at takeoff keeps recreational flights out of FAA registration and Remote ID entirely, which is the single largest piece of friction between buying a drone and flying one. Everything else on the aircraft is built around holding that weight while still being useful.
The camera is a 1/2.3-inch 12 MP CMOS shooting 4K at 30fps on a real 3-axis mechanical gimbal, not electronic stabilization. That gimbal is what separates footage you can use from footage that looks like a phone taped to a toy. DJI O2 transmission runs the live feed out to 10 km under FCC rules, the 2,250 mAh pack is rated at 31 minutes, and the airframe holds position in Level 5 wind at 10.7 m/s with a 4,000 m service ceiling. Folded, it is 138 by 81 by 58 mm, which is a jacket pocket.
Understand what it is not. This is a GPS-stabilized camera platform flown from a phone screen with one-tap takeoff, hover, and return-to-home. It is the opposite of an FPV quad: no goggles, no acro, no manual throttle. It also carries only downward obstacle sensing, so it will not dodge a tree branch. For aerial photography, property and terrain survey, or scouting ground you are about to walk, it is the most capable thing available at $299 that keeps recreational flying out of the registration and Remote ID system; commercial and other non-recreational use still requires registration.
Add the Mini 4K to your build and see how it enhances your platform.