This is a 1995 Boss OS-2 with the Marshall mod. Most people who do this mod mount the LEDs to the circuit board and you never know they re there. I opted to mount them where they could be seen. The blue center light is the power light and will stay on when the pedal is on. The other two LEDs light up in response to the guitar.I also got bored one day and painted some graphics on it that remind me of the 90 s Trapper Keeper. Pedal works great. It functions with 9V battery or an AC adapter.If you want something that stands out and no one else has this is it!

Boss OS-2 Overdrive/Distortion
$59.84