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OMI RING Affordable PEMF Therapy Ring Applicator - Pulsed Electromagnetic Field Therapy System PEMF therapy device for professional and home use Pull it over the head down to the neck, or slip a limb through it Ring applicator diameter: 11 inch Adjustable frequency from 1 to 99 Hz, adjustable therapy time from 1 to 30 minutes Square waveform,... OMI RING Affordable PEMF Therapy Ring Applicator - Pulsed Electromagnetic Field Therapy System