Crazyflie Multi-ranger deckThe multi ranger deck gives the Crazyflie 2. X the ability to detect objects around it. This is done by measuring the distance to objects in the following 5 directions: front back left right up with mm precision up to 4 meters. To get the most out of your Multi ranger it should be paired with a Flow deck , which will measure the movement along the ground and the distance to the ground. Features Fast, accurate distance ranging Measures absolute range