ISP Technologies Stealth Compact Floor Power Amplifier for Guitar Usable in Stereo 280 watts or Mono Bridged 1x 180 watts Smallest lightest high power amplifier for the guitarist available 9 X 4 X 1.75 inches 1.2 lbs External 19VCD switch-mode power supply included for operation from 100VAC to 240VAC Class A/B amplifier circuit for analog saturation and clipping sonic performance Internal protection for shorts and open circuit