Ok, I don't usually poo-poo a product that someone else may love. This product is SO terrible that the world needs a warning. I bought it used when I went in to buy a Korg rack tuner. I should know better. The purpose of a rack tuner is so a quick glance over will tell you instantly if you are in tune. The Behringer is so slow, it gets an input signal, and,well...thinks about it for a while, and decides whether it's going to acknowledge by showing something on the display. Also, it only tunes your E-string with a harmonic, it doesn't 'hear' an open note. Low B, forget it. The reviews told me that, and I bought it anyway! I does have the best rack lights in the business, so I almost kept it just for COOL factor, but alas, keep it AND put my pedal tuner back on my board???? $40 bucks I could have bought some burrito's and Pepsi, but I bought this POS. We tested it against a fresh from the box one. Just as bad.