Peavey ValveKing Footswitch.

The Peavey Valve King Footswitch features:
Two button footswitch with LEDs
Switch options are channel select or lead volume/gain boost
Includes 15 foot cable with right angle 1/4" stereo connector

Dimensions - Unpacked  7.875" W x 2.062" H x 4.125" D 
Weight - Unpacked  0.5