UPDATE original review below. I bought 2, one for salt and one for pepper. They were fully charged in about 1 hour. There is an adjustable grinding degree scale on the top. The kit includes a brush for cleaning and charging the rather short cables. You can use any regular USB cable you have and I did this for the initial charge. The basis - transparent glass. There's a rubber bar (or something similar) that you push down on and it grinds until you stop it. You no longer have to twist your wrist when trying to hold the grinder. It has become less comfortable with age. I've only just started using them and I hope they carry a fee for a reasonable time. Also, I had to put an extension cord on the kitchen counter, which also contained USB ports. I didn't want to take them into my bedroom to charge them when they needed it. They are quite heavy - partly because of the glass bottom. They recommend filling no more than 80% to ensure they are grinding properly. I followed this advice. I don't hesitate to update my reviews when new information seems useful. UPDATE: February 20, 2021 Just a quick note. I've found that when you turn coffee grinders over, they start working. At first they didn't. Why, I'm not sure. But if you tip them, they keep grinding and rubbing until you fix them. At least mostly. There is an on/off button. Which is good because they don't always grind as they rotate. Hm. One star less for reliability, that's not really 5 stars. But I still think it's at least 4.
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