Deerc D40 - Speed Switch; Altitude-hold Function

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12.3 Speed Switch
This drone comes with 2 speed modes (Low/High). As shown above,
push the Speed Switch button to the left, the transmitter sends out a
“Di” sound, indicating Low Speed. Push the Speed Switch button to the
right, the transmitter sends out a “DiDi” sound, indicating High Speed.
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12.4 Altitude-hold Function
The drone is designed with an altitude-hold function to maintain its
altitude after releasing the left joystick. (The left joystick will automatically
spring back to the middle)