PEMF 4000 Professional Case Model therapy machine includes: Mobil control box, 34 foot rope, power cord and manual. Produces square waveform from 5 to 60 Hertz at up to 2 Tesla (2,000,000 microtesla). Simple adjustment with one knob. This machine is professionally refurbished with upgrades at Tesla Wellcare manufacturing in Los Angeles and is ready to use. The tungsten electrodes in the spark chamber make this machine completely up to date with increased duty cycle and longevity.