1. The KJ4-AP is our newest model,have 3 years quality warrenty.
2. KJ4-AP slove most of the problem occur in old models such as KJ4-3-A and zincy tension lock which widely used in the market such as the springs easily to broke,can't lock firmly.
3.With Tuv test Report.
5 advanced details from old model KJ4-3-A which widely used in the market:
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