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This one took 8 hours to fully charge and run for 55 mins. Not impressive but that is sufficient for the task. I use it to shave my pubic hairs and it's quite easy and safe. You can still get micro cuts if you use it on your balls but it'll be perfectly safe if you won't go there. A decent solution for the job. Recommended.
I bought this product a few months ago expecting it to trim my hair without any hassle. After trying it a few times I thought I could be using it wrong and there must be a better way of using it. I am still not able to get it right and finally gave up.