Xiaomi mi electric scooter pro 2 vs 4 July 8, 2019 16 32 64 128 Xiaomi scooter pro 2 vs 4 pro Xiaomi mi pro 2 vs mi electric scooter 3 Xiaomi pro 2 vs pro 4 Xiaomi mi electric scooter pro 2 range Xiaomi scooter pro 2 vs 1s