The Marshall PEDL-00001 Universal Single LED Footswitch, it's a single channel footswitch that'll work seamlessly with the majority of Marshall electric and acoustic guitar amps. It was also formerly known as the PED801 Footswitch for the ASD100 Combo Amplifier, making it perfect for any player seeking a replacement for their PED801 Footswitch as well. But if you're simply after a universal single button footswitch for your Marshall Amplifier, this PEDL-0001 is going to be perfect for the job. World renowned Marshall quality - at your feet.