There are numerous scientific studies showing the benefits of PEMF, including a major one done by NASA.  It has been used for many years on racehorses and it has been FDA approved for over 25 years for issues such as bone healing, surgical pain and healing, and even depression.

PEMF machines work in conjunction with the body’s own recovery processes to relieve pain by restoring cells’ ability to function efficiently.
Our skins, bones, and organs are composed of tiny cells. The membrane of a healthy cell has both positive and negative charges that are required for the exchange of potassium, sodium, and calcium ions. When cells become distressed from disease, trauma or toxins, they lose their ability to function efficiently. PEMF restores the positive and negative charges in the cell, enabling it to perform its natural function while speeding tissue recovery.
The iMRS system is the culmination of more than 15 years of experience in PEMF and energy medicine.  It is unique in offering biofeedback technology helping to find the optimal settings for the user.  Included in your session is integrated light and sound therapy, which is perhaps best described as a "healing spa for your mind".  It works seamlessly with the iMRS 2000 mat to give you the relaxation frequencies via light and sound that will melt away stress, increase oxygenation in your brain, deepen your ability to relax, restore healthy sleep and alleviate depression and improve emotional balance.
Session length varies depending on your particular issues.  Rates are $1 per minute, with most sessions being 30 minutes or less.