1 defective device received on 2

This is certainly a great product for a very low price, with a lot of features and capabilities.
Unfortunately the quality is too random (buy this product falls under the lottery, but with the guarantee of return from Amazon.com you take no risk, thank you again for the Amazon return policy)
Product is great but I noted bad points:
- Impossible to order additional batteries (not found for this model) = big negative.
- The use of software is a nightmare, impossible to use without documentation (you have to search the net to find USB driver supplied cable and software incomprehensible in English)

If the production was good with batteries available, I give 5 stars