custom firmware speed up to 35 km / h ( es2) - Scooter Talk
Original Ninebot ES2 & ES4 | e-Bikescooter
How to flash your Ninebot Scooter - ScooterHacking.org
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Ninebot by Segway ES2 Kick Scooter - High Performance, 8-Inch Front and 7.5-Inch Back tires, up to 15.5 Mile Range, 15.5mph Top Speed, Cruise Control, Mobile App Connectivity: Buy Online at Best