A part of the review has been auto-translated.
The product came properly packaged, and after a short first test it worked its way through a large tree branch of 7cm diameter. It is good that there is a lock button unlike other similar items. The motor seems to be powerful enough for its purpose. Only design flaw, the fact that the mechanism designed to pull and stretch the chain, is using a screw placed not in an ergonomic position, and you may find yourself using the screwdriver quite frequently.
I have to admit I was dubious about this product. As well as a similar product being featured in a lot of Facebook SCAMS it was difficult to believe that it would really work that well. So, I eat my words! This little chain saw is amazing. The battery life is reasonable bearing in mind the work it is doing . It cuts 50mm timber quite easily. It says that no oil is required but I spray some WD40 on the bar before and after use. The batteries as not rapid charge so I would always recommend buying two batteries - they are cheap enough if bought at the same time. I have already recommended it to some friends and I do not do that lightly!