In October 2008 I purchased a Dean Markley PT-13 Chromatic Tuner from Guitar Center in Illinois for $59.99. Shortly after purchase, one of the tuner's LED lamps began behaving erratically, then stopped working entirely. Also at times the tuner "freezes" up and fails to operate at all. There is nothing in the accompanying manual about this behavior. I've repeatedly tried contacting Dean Markley via their online web form and telephone for over a month now, but they've responded to neither. While the tuner is still usable, I'm angered and disappointed by the lack of Dean Markley's support for this product. Meanwhile Guitar Center appears to be just as clueless about this product. This is the last Dean Markley product I'll ever buy.