The Lenovo E1 smart watch came out a month a go on the market and decited to grab one right away and test it. I have been using different smart watches and bracelets for years, and in the last 6 months an Android wear watch, which was very good, but having to charge it every night definitely caused me to start looking for better alternatives with a longer battery life.
The Lenovo E1 is one of those with a battery life of 7-8 days, I can comfortably travel and come back home without having to think about charging cables or cradles.
Obviously there are a few things that I would like to see addressed by Lenovo in future firmware updates, but most of them are just knit picking on my part, overall I can definitely recommend it and especially for the price under $40!

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