Great for the price
I give it four stars because they’re not trying to charge you some dumb monthly fee which drives me crazy sometimes. It does what it is supposed to do which is great. However, controlling the frequency doesn’t work like the instructions say. for me only the first way works. Not a huge deal, but would be nice if it did work as it says. There is 3 ways to input wave values: With the sliders (bars). Tapping the buttons "-0.01" or "+0.01" - You can hold to keep increasing the wave value. Tapping the current wave value and input the desired value in the dialog box.