The LED is supposed to change color in response to the strength of your picking, but with this unit, the LED stays lit without changing color when the switch is turned on. Please note that while the sound functionality works without issue, the LED behavior is as described. This is a discontinued product, so if you've been looking for one, don't miss out. - Brand: Bogner - Model Name: Harlow - Accessories: Box, Instruction Manual Thank you for looking.