Summary: I am giving the keyboard a low grade because it really disappoint me on how it is sensitive to distance. I bought it to use with a Minix Android device in order to control my Restaurant Queue. The Device is around 5 feet distant from the keyboard and in this little distance I was having and intermittent response. Replacing the batteries did not fix the problem. Switched it by an IBM Mouse/Keyboard set and it worked perfectly.
Summary: Definitely feels and works like a $15 dollar wireless numpad. Also, it has a range of like 3-4 ft with no obstructions. If you have something like a keyboard in the way, forget about the connection.