5 upgrades:
1. The front beam changes position to be more firm
2. The pedal is changed into a mold to make the ABS material wear-resistant and beautiful
3. The armrest can be turned up to facilitate the disabled or the elderly to get on and off
4. It is easy to adjust the disc brake to a special drum brake, which is more wear-resistant
5. It is easier to push and pull out the high magnetic limit pull rod
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