You only need electricity...the compressor is built-in. Gravermeister can transform your creative dreams and ambition into beautiful things you make with your own hands. Technically, Gravermeister is an air tool that makes its own special air pulses. These pulses move a hammer piston back and forth inside the handpiece, creating impact power. A foot pedal lets you vary the power instantly as you work. The impact rate is adjustable from 1600 to 2400 impacts per minute. With Gravermeister, you can engrave deeply in steel and delicately in gold, carve wood effortlessly, set large and small stones with confidence, texture metal quickly, sculpt stone precisely and more. Continuously improved, the latest Gravermeister cuts smoother, is completely oil-free and features advanced Quick Change handpieces. Shipping weight 44 lbs.