In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The SWR WorkingPro 400 gives you classic SWR tone and clarity, 400 watts of dependable solid-state power, the exclusive tone-expanding Aural Enhancer circuitry, SWR’s brand new Bass Intensifier, a 3-band active EQ with variable midrange and more! Includes a 2-button footswitch!