Please be careful here. There are many knockoffs of Huben power. They do not sell on Aliexpress, THAT is a 100% pure rip-off product. The Aliexpress is made using inferior metals and in some cases, conventional carbon steel internals are used which causes severe rust and corrosion.
Only reach out to HUBEN POWER through their official website HubenPower.Com. We are in the process of negotiating distributorship with them so I am very intimate with all the specifics of the actual Huben Power products.