SPNA » balancing Self Balancing Long Range 30km/h Pro Electric Scooter Designed By Porsche 350w Fastest Ninebot MAX Part 2 TestingPlease ensure that the scooter is securely packed. If no fault is confirmed. Check the battery level or your speed, in a quick glance. self balancing long range 30km/h pro electric scooter designed by porsche 350w.