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The instruction page is a small three 6" x 2" note with little information about the suggested use and no helpful tips about this device. As a novice, reading "raise the sensitivity to your requirements" was not helpful. It does not explain anything about the requirements needed. It was easy to use, just a matter of clicking buttons in a sequence to change from one method to another. The educational advice was non existent and the English is badly written/translated from Chinese and rather comical. You are also offered a $50 "coupon" if you give a positive review. Since writing this, I have received at least 4 emails, to my personal email account, pleading with me to remove this "negative" review and stating they will give me a cash gift for doing so. I have reported each email to Amazon. (Their emails are now sent to spam). So I have edited this review to include this last paragraph.