Xiaomi e scooter 4 2nd generation July 8, 2019 16 32 64 128 Xiaomi e scooter 4 pro 2nd generation Xiaomi e scooter 4 lite 2nd generation Xiaomi e scooter 4 lite 2nd generation test Scooter xiaomi 4 Scooter xiaomi 4 pro Xiaomi scooter 4 ultra test Xiaomi scooter pro 2 ride Xiaomi scooter pro 2 vs 4 pro