Autel Robotics EVO II Dual 640T Enterprise Bundle V3 Drone with Thermal Imaging - Manual (Page 33)

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Note
 During charging, the LED indicators flash in turn. All LED indicators are on when
the battery is full.
4. Adjust the antennas
Extend the antennas of the remote controller. The strength of the signal received by
the antennas varies depending on their positions. The strongest signal can be
achieved when the antennas and the back of the remote controller form an angle of
180° or 260° degrees and the flat side of the antennas is facing the aircraft. When
you operate the aircraft, make sure that the aircraft is in the place for the best
communications.