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[1] Read through the Tello Quick Start Guide before flying. 
[2] Compatible remote controllers sold separately. The remote controller shown in the Say Hello to Tello video is a customized GameSir remote controller.  
[3] Estimated flight time is based on flying in windless conditions at a constant speed of 9.3 mph (15 kph). Actual flight times may vary depending on your environment. 
[4] Attainable when FCC compliant in an interference-free environment. 
[5] Propeller guards are recommended when using these functions. Fly with caution. 
[6] Failsafe Protection is automatically enabled when mobile device signal is weak or lost, the Tello App crashes, or the aircraft’s vision positioning system fails for more than 3 seconds.