Function feature: theres infrared induction around and at the bottom of the drone to have obstacle avoidance flight, you can use your hand in the air to control the steering of the drone;in case of sudden obstacles at the bottom, it will automatically rise, and when the obstacles at the bottom are evacuated, the drone will automatically fall below. Low power alarm: also can be used as an electric fan. Details: color: yellow, blue flying time: about 5-6minutes charging time: 40 minutes propeller size: 37mm packaging: color box number of driving motors(pcs): 4 pieces battery: 3. 7v 220mah with protective pcb size: 106*106*46mm charging details: input voltage 5v, output current 500ma, usb charger battery with overcharge and overdischarge protection pcb packaging size?12. 9*9. 3*12. 4 cm package contents: operation guide (1 set), propellers (1 set), usb charger (1 pcs) (udi-u58)