Very good performance and one of the best in the market. You have to put in a AA battery to use it
Design wise you can rate it 4 star.And the device is not that battery consuming compared to many other devices in market.I bought it with manufacturer warranty.
Company promised that one single battery will work for minimum one year. And I think that is true as I am using it for quite some time and no short of performance yet.Very easy to work device. The main thing is that you do not need to install any software to use it. So, I recommend all to have it.Very good product.Value for money.