Parrot Mini Drone review - The “Rolling spider”

The Parrot Rolling Spider is an ultra-compact, palm sized quadcopter drone controlled by a smartphone and using a sophisticated sensor array of an ultrasonic sensor, a 3-axis gyroscope, 3-axis accelerometer, a vertical camera and a pressure sensor.
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“6 times lighter than AR.Drone and the same flight stability thanks to an autopilot based on a 3-axis gyroscope and 3-axis accelerometer.
• Pressure sensor for the flight altitude
• Ultrasonic sensor for precision flying near the ground
• Its vertical camera at 60 fps measures the speed comparing previous image.
This ultra-sophisticated technology based on sensor data fusion makes Rolling Spider one of the world's most stable drones.
It has an exclusive free-fall take-off mode: its engines start when you drop it.
Capture aerial views with the vertical mini-camera.”