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Its realy weak that shoulder pad its nowhere near as HC HailiCare where are biger motor And heating that almost can fry the skin, altough HailiCare was around 40 dolars And this one mybe 11euro or more, the only flaw on HailiCare was When I did buy I did not receive battery I needed to buy BMS on Bangood but 2S 3A/or 2A was weak eventually stoped working, I was quite disapointed that Bangood did not provide battery And that battery was difficult to find, I did tray to make my own battery, I did buy BMS on Aliexpress as Bangood was to expensive, but did not Work long does not Work long, I have another 5a 2S from aliexpress I need to solder that on mybe on other two battery, the problem was at same time two function Work heating And, not bad quality this cheap one but its weak in my opinion, ok Thanks