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" ... Some very small “microdrones” do specify 24-hour or indefinite capability, though these systems are inherently constrained in payload (lower magnification cameras, for example) and maximum altitude. Some of these drones also can optionally detach the cable if wider range of movement is desired and fly on batteries for up to 20 minutes. Conversely, there are also tethered UASs with greater payload and/or maximum altitude, but lower or unspecified endurance. ... "