David Clark 40071G-04, Footswitch use with U3813, U3814, U3815(A) & U3816 Quantity in Basket: None Code: 40071G04 Price: $194.00 Shipping Weight: 4.00 pounds Quantity: 40071G-04 FOOTSWITCH May be used with U3813, U3814, U3815A & U3816.